The United States of America known as the United States or America, is a country composed of 50 states, a federal district, five major self-governing territories, various possessions. At 3.8 million square miles, the United States is the world's third or fourth largest country by total area and is smaller than the entire continent of Europe's 3.9 million square miles. With a population of over 327 million people, the U. S. is the third most populous country. The capital is Washington, D. C. and the largest city by population is New York City. Forty-eight states and the capital's federal district are contiguous in North America between Canada and Mexico; the State of Alaska is in the northwest corner of North America, bordered by Canada to the east and across the Bering Strait from Russia to the west. The State of Hawaii is an archipelago in the mid-Pacific Ocean; the U. S. territories are scattered about the Pacific Ocean and the Caribbean Sea, stretching across nine official time zones. The diverse geography and wildlife of the United States make it one of the world's 17 megadiverse countries.
Paleo-Indians migrated from Siberia to the North American mainland at least 12,000 years ago. European colonization began in the 16th century; the United States emerged from the thirteen British colonies established along the East Coast. Numerous disputes between Great Britain and the colonies following the French and Indian War led to the American Revolution, which began in 1775, the subsequent Declaration of Independence in 1776; the war ended in 1783 with the United States becoming the first country to gain independence from a European power. The current constitution was adopted in 1788, with the first ten amendments, collectively named the Bill of Rights, being ratified in 1791 to guarantee many fundamental civil liberties; the United States embarked on a vigorous expansion across North America throughout the 19th century, acquiring new territories, displacing Native American tribes, admitting new states until it spanned the continent by 1848. During the second half of the 19th century, the Civil War led to the abolition of slavery.
By the end of the century, the United States had extended into the Pacific Ocean, its economy, driven in large part by the Industrial Revolution, began to soar. The Spanish–American War and World War I confirmed the country's status as a global military power; the United States emerged from World War II as a global superpower, the first country to develop nuclear weapons, the only country to use them in warfare, a permanent member of the United Nations Security Council. Sweeping civil rights legislation, notably the Civil Rights Act of 1964, the Voting Rights Act of 1965 and the Fair Housing Act of 1968, outlawed discrimination based on race or color. During the Cold War, the United States and the Soviet Union competed in the Space Race, culminating with the 1969 U. S. Moon landing; the end of the Cold War and the collapse of the Soviet Union in 1991 left the United States as the world's sole superpower. The United States is the world's oldest surviving federation, it is a representative democracy.
The United States is a founding member of the United Nations, World Bank, International Monetary Fund, Organization of American States, other international organizations. The United States is a developed country, with the world's largest economy by nominal GDP and second-largest economy by PPP, accounting for a quarter of global GDP; the U. S. economy is post-industrial, characterized by the dominance of services and knowledge-based activities, although the manufacturing sector remains the second-largest in the world. The United States is the world's largest importer and the second largest exporter of goods, by value. Although its population is only 4.3% of the world total, the U. S. holds 31% of the total wealth in the world, the largest share of global wealth concentrated in a single country. Despite wide income and wealth disparities, the United States continues to rank high in measures of socioeconomic performance, including average wage, human development, per capita GDP, worker productivity.
The United States is the foremost military power in the world, making up a third of global military spending, is a leading political and scientific force internationally. In 1507, the German cartographer Martin Waldseemüller produced a world map on which he named the lands of the Western Hemisphere America in honor of the Italian explorer and cartographer Amerigo Vespucci; the first documentary evidence of the phrase "United States of America" is from a letter dated January 2, 1776, written by Stephen Moylan, Esq. to George Washington's aide-de-camp and Muster-Master General of the Continental Army, Lt. Col. Joseph Reed. Moylan expressed his wish to go "with full and ample powers from the United States of America to Spain" to seek assistance in the revolutionary war effort; the first known publication of the phrase "United States of America" was in an anonymous essay in The Virginia Gazette newspaper in Williamsburg, Virginia, on April 6, 1776. The second draft of the Articles of Confederation, prepared by John Dickinson and completed by June 17, 1776, at the latest, declared "The name of this Confederation shall be the'United States of America'".
The final version of the Articles sent to the states for ratification in late 1777 contains the sentence "The Stile of this Confederacy shall be'The United States of America'". In June 1776, Thomas Jefferson wrote the phrase "UNITED STATES OF AMERICA" in all capitalized letters in the headline of his "original Rough draught" of the Declaration of Independence; this draft of the document did not surface unti
The Nasdaq Stock Market is an American stock exchange. It is the second-largest stock exchange in the world by market capitalization, behind only the New York Stock Exchange located in the same city; the exchange platform is owned by Nasdaq, Inc. which owns the Nasdaq Nordic and Nasdaq Baltic stock market network and several U. S. stock and options exchanges. "Nasdaq" was an acronym for the National Association of Securities Dealers Automated Quotations. It was founded in 1971 by the National Association of Securities Dealers, which divested itself of Nasdaq in a series of sales in 2000 and 2001; the Nasdaq Stock Market is owned and operated by Nasdaq, Inc. the stock of, listed on its own securities exchange on July 2, 2002, under the ticker symbol NDAQ. The Nasdaq Stock Market began trading on February 8, 1971, it was the world's first electronic stock market. At first, it was a "quotation system" and did not provide a way to perform electronic trades; the Nasdaq Stock Market helped lower the spread but was unpopular among brokerages which made much of their money on the spread.
The NASDAQ Stock Market assumed the majority of major trades, executed by the over-the-counter system of trading, but there are still many securities traded in this fashion. As late as 1987, the Nasdaq exchange was still referred to as "OTC" in media reports and in the monthly Stock Guides issued by Standard & Poor's Corporation. Over the years, the Nasdaq Stock Market became more of a stock market by adding trade and volume reporting and automated trading systems, it was the first stock market in the United States to trade online, highlighting Nasdaq-traded companies and closing with the declaration that the Nasdaq Stock Market is "the stock market for the next hundred years". The Nasdaq Stock Market attracted new growth companies, including Microsoft, Cisco and Dell, it helped modernize the IPO, its main index is the NASDAQ Composite, published since its inception. However, its exchange-traded fund tracks the large-cap NASDAQ-100 index, introduced in 1985 alongside the NASDAQ Financial-100 Index, which tracks the largest 100 companies in terms of market capitalization.
In 1992, the Nasdaq Stock Market joined with the London Stock Exchange to form the first intercontinental linkage of securities markets. The National Association of Securities Dealers spun off the Nasdaq Stock Market in 2000 to form a publicly traded company. On March 10, 2000, the NASDAQ Composite peaked at 5,132.52, but fell to 3,227 by April 17, in the following 30 months fell 78% from its peak. In 2006, the status of the Nasdaq Stock Market was changed from a stock market to a licensed national securities exchange. In 2010, Nasdaq merged with OMX, a leading exchange operator in the Nordic countries, expanded its global footprint, changed its name to the NASDAQ OMX Group. To qualify for listing on the exchange, a company must be registered with the United States Securities and Exchange Commission, must have at least three market makers and must meet minimum requirements for assets, public shares, shareholders. In February 2000, in the wake of an announced merger of NYSE Euronext with Deutsche Börse, speculation developed that NASDAQ OMX and Intercontinental Exchange could mount a counter-bid of their own for NYSE.
NASDAQ OMX could be looking to acquire the American exchange's cash equities business, ICE the derivatives business. At the time, "NYSE Euronext's market value was $9.75 billion. Nasdaq was valued at $5.78 billion, while ICE was valued at $9.45 billion." Late in the month, Nasdaq was reported to be considering asking either ICE or the Chicago Mercantile Exchange to join in what would have to be, if it proceeded, an $11–12 billion counterbid. In 2005, NASDAQ acquirred Instinet for $1.9 billion retaining the INET ECN and subsequently sellin the agency brokerage business to Silver Lake Partners and Instinet management. The European Association of Securities Dealers Automatic Quotation System was founded as a European equivalent to the Nasdaq Stock Market, it became NASDAQ Europe. Operations were shut however, as a result of the burst of the dot-com bubble. In 2007, NASDAQ Europe was revived as Equiduct, is operating under Börse Berlin. On June 18, 2012, Nasdaq OMX became a founding member of the United Nations Sustainable Stock Exchanges Initiative on the eve of the United Nations Conference on Sustainable Development.
In November 2016, Nasdaq chief operating officer Adena Friedman was promoted to the role of CEO, becoming the first woman to run a major exchange in the U. S. In 2016, Nasdaq earned $272 million in listings-related revenues. In October 2018, the SEC ruled that the NYSE and Nasdaq did not justify the continued price increases when selling market data. Nasdaq quotes are available at three levels: Level 1 shows the highest bid and lowest ask—inside quote. Level 2 shows all public quotes of market makers together with information of market dealers wishing to buy or sell stock and executed orders. Level 3 allows them to enter their quotes and execute orders; the Nasdaq Stock Market sessions eastern time are: 4:00 am to 9:30 am premarket session 9:30 am to 4:00 pm normal trading session 4:00 pm to 8:00 pm postmarket sessionThe Nasdaq Stock Market averages about 253 trading days per year. The Nasdaq Stock Market has three different market tiers: Capital Market is an equity market for companies that have relatively
New York Stock Exchange
The New York Stock Exchange is an American stock exchange located at 11 Wall Street, Lower Manhattan, New York City, New York. It is by far the world's largest stock exchange by market capitalization of its listed companies at US$30.1 trillion as of February 2018. The average daily trading value was US$169 billion in 2013; the NYSE trading floor is located at 11 Wall Street and is composed of 21 rooms used for the facilitation of trading. A fifth trading room, located at 30 Broad Street, was closed in February 2007; the main building and the 11 Wall Street building were designated National Historic Landmarks in 1978. The NYSE is owned by Intercontinental Exchange, an American holding company that it lists, it was part of NYSE Euronext, formed by the NYSE's 2007 merger with Euronext. The NYSE has been the subject of several lawsuits regarding fraud or breach of duty and in 2004 was sued by its former CEO for breach of contract and defamation; the earliest recorded organization of securities trading in New York among brokers directly dealing with each other can be traced to the Buttonwood Agreement.
Securities exchange had been intermediated by the auctioneers who conducted more mundane auctions of commodities such as wheat and tobacco. On May 17, 1792 twenty four brokers signed the Buttonwood Agreement which set a floor commission rate charged to clients and bound the signers to give preference to the other signers in securities sales; the earliest securities traded were governmental securities such as War Bonds from the Revolutionary War and First Bank of the United States stock, although Bank of New York stock was a non-governmental security traded in the early days. The Bank of North America along with the First Bank of the United States and the Bank of New York were the first shares traded on the New York Stock Exchange. In 1817 the stockbrokers of New York operating under the Buttonwood Agreement instituted new reforms and reorganized. After sending a delegation to Philadelphia to observe the organization of their board of brokers, restrictions on manipulative trading were adopted as well as formal organs of governance.
After re-forming as the New York Stock and Exchange Board the broker organization began renting out space for securities trading, taking place at the Tontine Coffee House. Several locations were used between 1865, when the present location was adopted; the invention of the electrical telegraph consolidated markets, New York's market rose to dominance over Philadelphia after weathering some market panics better than other alternatives. The Open Board of Stock Brokers was established in 1864 as a competitor to the NYSE. With 354 members, the Open Board of Stock Brokers rivaled the NYSE in membership "because it used a more modern, continuous trading system superior to the NYSE’s twice-daily call sessions." The Open Board of Stock Brokers merged with the NYSE in 1869. Robert Wright of Bloomberg writes that the merger increased the NYSE's members as well as trading volume, as "several dozen regional exchanges were competing with the NYSE for customers. Buyers and dealers all wanted to complete transactions as and cheaply as technologically possible and that meant finding the markets with the most trading, or the greatest liquidity in today’s parlance.
Minimizing competition was essential to keep a large number of orders flowing, the merger helped the NYSE to maintain its reputation for providing superior liquidity." The Civil War stimulated speculative securities trading in New York. By 1869 membership had to be capped, has been sporadically increased since; the latter half of the nineteenth century saw rapid growth in securities trading. Securities trade in the latter nineteenth and early twentieth centuries was prone to panics and crashes. Government regulation of securities trading was seen as necessary, with arguably the most dramatic changes occurring in the 1930s after a major stock market crash precipitated the Great Depression; the Stock Exchange Luncheon Club was situated on the seventh floor from 1898 until its closure in 2006. The main building, located at 18 Broad Street, between the corners of Wall Street and Exchange Place, was designated a National Historic Landmark in 1978, as was the 11 Wall Street building; the NYSE announced its plans to merge with Archipelago on April 21, 2005, in a deal intended to reorganize the NYSE as a publicly traded company.
NYSE's governing board voted to merge with rival Archipelago on December 6, 2005, became a for-profit, public company. It began trading under the name NYSE Group on March 8, 2006. A little over one year on April 4, 2007, the NYSE Group completed its merger with Euronext, the European combined stock market, thus forming NYSE Euronext, the first transatlantic stock exchange. Wall Street is the leading US money center for international financial activities and the foremost US location for the conduct of wholesale financial services. "It comprises a matrix of wholesale financial sectors, financial markets, financial institutions, financial industry firms". The principal sectors are securities industry, commercial banking, asset management, insurance. Prior to the acquisition of NYSE Euronext by the ICE in 2013, Marsh Carter was the Chairman of the NYSE and the CEO was Duncan Niederauer. Presently, the chairman is Jeffrey Sprecher. In 2016, NYSE owner Intercontinental Exchange Inc. earned $419 million in listings-related revenues.
The exchange was closed shortly after the beginning of World War I, but it re-opened on November 28 of that year in order to help the war effort by trading bonds, reopened for stock tradin
Citigroup Inc. or Citi is an American multinational investment bank and financial services corporation headquartered in New York City. The company was formed by the merger of banking giant Citicorp and financial conglomerate Travelers Group in 1998. Citigroup owns Citicorp, the holding company for Citibank, as well as several international subsidiaries. Citigroup is ranked 3rd on the list of largest banks in the United States and, alongside JPMorgan Chase, Bank of America, Wells Fargo, it is one of the Big Four banks of the United States, it is a systemically important financial institution and is on the list of systemically important banks that are too big to fail. It is one of the nine global investment banks in the Bulge Bracket. Citigroup is ranked 32nd on the Fortune 500 as of 2018. Citigroup does business in more than 160 countries, it has 214,000 employees, although it had 357,000 employees before the financial crisis of 2007-2008, when it was rescued via a massive stimulus package by the U.
S. government. Citigroup is the holding company for the following divisions: Inc.. Citigroup Global Markets Limited, Citigroup Global Markets Japan - broker dealers, including one of 24 primary dealers in United States Treasury securities. Citi's Institutional Clients Group offers investment and corporate banking services and products for companies, governments and ultra high-net-worth investors. ICG consists of the following five main divisions:Capital Markets Origination is focused on the capital-raising needs such as public offerings, private placements, special purpose acquisition companies. Corporate & Investment Banking provides strategic and financing products and advisory services to multinational and local corporations, financial institutions and held businesses in more than 160 countries, it provides client services such as mergers & acquisitions advice and underwriting of initial public offerings. Markets & Securities Services includes investor services and direct custody and clearing, hedge fund and private equity servicing, issuer businesses.
It provides financial products through underwriting, sales & trading of a range of investment assets. Products offered include servicing of equities, credit, foreign exchange, emerging markets, G10 rates, prime finance/brokerage services, securitized markets, such as collateralized debt obligations and mortgage-backed securities, its Citi Research team provides equity and fixed income research, sector and geographic market analysis, product-specific analysis for Citi's individual and institutional clients. Its flagship research reports include the following: Portfolio Strategist, Bond Market Roundup, U. S. Economics Weekly, International Market Roundup, Global Economic Outlook & Strategy and the Global Equity Strategist. Citi Private Bank advises professional investors, ultra high-net-worth individuals and families, lawyers throughout the world, it uses an open architecture network of more than 800 private bankers and investment professionals across 46 countries and jurisdictions to provide clients access to global investment opportunities.
It has over $250 billion in assets under management. The minimum net worth requirement is $25 million in liquid assets and is waived for only law firm groups and other clients under special circumstances. Treasury and Trade Solutions provides cash management and securities services to companies and other institutions in the U. S. and more than 140 countries. TTS intermediates more than $3 trillion in global transactions daily, it has over $13 trillion assets under custody, about $377 billion in average liability balances, serves 99% of world's Fortune 100 companies and ~85% of the world's Fortune 500 companies, has 10 regional processing centers worldwide using global processes. Institutions use TTS to support their treasury operations with global solutions for payments, collections and investments by working in partnership with export credit agencies and development banks, it sells supply chain financing products as well as medium- and long-term global financing programs across multiple industries.
Clients doing business with Citi in 10 or more countries generate more than 60% of Transaction Services' total revenues. Grupo Financiero Banamex - the second largest bank in Mexico, it serves about 20 million clients. Citicorp - the holding company for Citibank as well as several international banks. Citicorp contains Global Consumer Banking and Institutional Clients Group. Citibank Retail banking encompasses Citi's global branch network, branded Citibank. Citibank holds more than $300 billion in deposits. Citibank is the 4th largest retail bank in the United States based on deposits, it has Citibank branded branches in countries throughout the world, with the exception of Mexico, under a separate subsidiary called Banamex. Citibank offers checking and savings accounts, small business and commercial banking and personal wealth management among its services. Citibank offers Citigold services worldwide to mass affluent clients with at least US$200,000 in liquid assets. In certain markets, Citigold Select is available for clients with at least US$500,000 in liquid assets.
Its highest level of service, Citigold Private Client, is for high-net-worth individuals with at least $1–$3 million in liquid assets and offers access to investments and ideas from Citi Private Bank. Citi Branded Cards is the world's largest credit card issuer. Citi Retail Services is one of the largest prov
Delaware is one of the 50 states of the United States, in the South-Atlantic or Southern region. It is bordered to the south and west by Maryland, north by Pennsylvania, east by New Jersey and the Atlantic Ocean; the state takes its name from Thomas West, 3rd Baron De La Warr, an English nobleman and Virginia's first colonial governor. Delaware occupies the northeastern portion of the Delmarva Peninsula. It's the sixth most densely populated. Delaware's largest city is Wilmington; the state is divided into the lowest number of any state. From north to south, they are New Castle County, Kent County, Sussex County. While the southern two counties have been predominantly agricultural, New Castle County is more industrialized. Before its coastline was explored by Europeans in the 16th century, Delaware was inhabited by several groups of Native Americans, including the Lenape in the north and Nanticoke in the south, it was colonized by Dutch traders at Zwaanendael, near the present town of Lewes, in 1631.
Delaware was one of the 13 colonies participating in the American Revolution. On December 7, 1787, Delaware became the first state to ratify the Constitution of the United States, has since been known as "The First State"; the state was named after the Delaware River, which in turn derived its name from Thomas West, 3rd Baron De La Warr, the ruling governor of the Colony of Virginia at the time Europeans first explored the river. The Delaware Indians, a name used by Europeans for Lenape people indigenous to the Delaware Valley derive their name from the same source; the surname de La Warr is of Anglo-Norman origin. It came from a Norman lieu-dit La Guerre; this toponymic could derive from the Latin word ager, from the Breton gwern or from the Late Latin varectum. The toponyms Gara, Gaire appear in old texts cited by Lucien Musset, where the word gara means gore, it could be linked with a patronymic from the Old Norse verr. Delaware is 96 miles long and ranges from 9 miles to 35 miles across, totaling 1,954 square miles, making it the second-smallest state in the United States after Rhode Island.
Delaware is bounded to the north by Pennsylvania. Small portions of Delaware are situated on the eastern side of the Delaware River sharing land boundaries with New Jersey; the state of Delaware, together with the Eastern Shore counties of Maryland and two counties of Virginia, form the Delmarva Peninsula, which stretches down the Mid-Atlantic Coast. The definition of the northern boundary of the state is unusual. Most of the boundary between Delaware and Pennsylvania was defined by an arc extending 12 miles from the cupola of the courthouse in the city of New Castle; this boundary is referred to as the Twelve-Mile Circle. Although the Twelve-Mile Circle is claimed to be the only territorial boundary in the United States, a true arc, the Mexican boundary with Texas includes several arcs, many cities in the South have circular boundaries; this border extends all the way east to the low-tide mark on the New Jersey shore continues south along the shoreline until it again reaches the 12-mile arc in the south.
To the west, a portion of the arc extends past the easternmost edge of Maryland. The remaining western border runs east of due south from its intersection with the arc; the Wedge of land between the northwest part of the arc and the Maryland border was claimed by both Delaware and Pennsylvania until 1921, when Delaware's claim was confirmed. Delaware is with the lowest mean elevation of any state in the nation, its highest elevation, located at Ebright Azimuth, near Concord High School, is less than 450 feet above sea level. The northernmost part of the state is part of the Piedmont Plateau with rolling surfaces; the Atlantic Seaboard fall line follows the Robert Kirkwood Highway between Newark and Wilmington. A ridge about 75 to 80 feet in elevation extends along the western boundary of the state and separates the watersheds that feed Delaware River and Bay to the east and the Chesapeake Bay to the west. Since all of Delaware is a part of the Atlantic coastal plain, the effects of the ocean moderate its climate.
The state lies in the humid subtropical climate zone. Despite its small size, there is significant variation in mean temperature and amount of snowfall between Sussex County and New Castle County. Moderated by the Atlantic Ocean and Delaware Bay, the southern portion of the state has a milder climate and a longer growing season than the northern portion of the state. Delaware's all-time record high of 110 °F was recorded at Millsboro on July 21, 1930; the all-time record low of −17 °F was recorded at Millsboro on January 17, 1893. The transitional climate of Delaware supports a wide variety of vegetation. In the northern third of the state are found Northeastern coastal forests and mixed oak forests typical of the northeastern United States. In the southern two-thirds of the state are found Middle Atlantic coastal forests. Trap Pond State Park, along with areas in other parts of Sussex County, for example, support
Symbiosis is any type of a close and long-term biological interaction between two different biological organisms, be it mutualistic, commensalistic, or parasitic. The organisms, each termed a symbiont, may be of different species. In 1879, Heinrich Anton de Bary defined it as "the living together of unlike organisms"; the term was subject to a century-long debate about whether it should denote mutualism, as in lichens. Symbiosis can be obligatory, which means that one or both of the symbionts depend on each other for survival, or facultative when they can live independently. Symbiosis is classified by physical attachment; when one organism lives on the surface of another, such as head lice on humans, it is called ectosymbiosis. The definition of symbiosis was a matter of debate for 130 years. In 1877, Albert Bernhard Frank used the term symbiosis to describe the mutualistic relationship in lichens. In 1879, the German mycologist Heinrich Anton de Bary defined it as "the living together of unlike organisms".
The definition has varied among scientists, with some advocating that it should only refer to persistent mutualisms, while others thought it should apply to all persistent biological interactions, in other words mutualisms, commensalism, or parasitism, but excluding brief interactions such as predation. Current biology and ecology textbooks use the latter "de Bary" definition, or an broader one where symbiosis means all interspecific interactions. In 1949, Edward Haskell proposed an integrative approach, proposing a classification of "co-actions" adopted by biologists as "interactions". Biological interactions can involve individuals of the same species or individuals of different species; these can be further classified by either the mechanism of the interaction or the strength and direction of their effects. Relationships can be obligate, meaning that one or both of the symbionts depend on each other for survival. For example, in lichens, which consist of fungal and photosynthetic symbionts, the fungal partners cannot live on their own.
The algal or cyanobacterial symbionts in lichens, such as Trentepohlia, can live independently, their symbiosis is, facultative. Endosymbiosis is any symbiotic relationship in which one symbiont lives within the tissues of the other, either within the cells or extracellularly. Examples include diverse microbiomes, nitrogen-fixing bacteria that live in root nodules on legume roots. Ectosymbiosis is any symbiotic relationship in which the symbiont lives on the body surface of the host, including the inner surface of the digestive tract or the ducts of exocrine glands. Examples of this include ectoparasites such as lice. Competition can be defined as an interaction between organisms or species, in which the fitness of one is lowered by the presence of another. Limited supply of at least one resource used by both facilitates this type of interaction, although the competition may exist over other'amenities', such as females for reproduction. Mutualism or interspecies reciprocal altruism is a long-term relationship between individuals of different species where both individuals benefit.
Mutualistic relationships may be either obligate for both species, obligate for one but facultative for the other, or facultative for both. A large percentage of herbivores have mutualistic gut flora to help them digest plant matter, more difficult to digest than animal prey; this gut flora is made up of cellulose-digesting protozoans or bacteria living in the herbivores' intestines. Coral reefs are the result of mutualisms between coral organisms and various types of algae which live inside them. Most land plants and land ecosystems rely on mutualisms between the plants, which fix carbon from the air, mycorrhyzal fungi, which help in extracting water and minerals from the ground. An example of mutualism is the relationship between the ocellaris clownfish that dwell among the tentacles of Ritteri sea anemones; the territorial fish protects the anemone from anemone-eating fish, in turn the stinging tentacles of the anemone protect the clownfish from its predators. A special mucus on the clownfish protects it from the stinging tentacles.
A further example is a fish which sometimes lives together with a shrimp. The shrimp cleans up a burrow in the sand in which both the shrimp and the goby fish live; the shrimp is blind, leaving it vulnerable to predators when outside its burrow. In case of danger, the goby touches the shrimp with its tail to warn it; when that happens both the shrimp and goby retreat into the burrow. Different species of gobies clean up ectoparasites in other fish another kind of mutualism. A non-obligate symbiosis is seen in encru
New York City
The City of New York called either New York City or New York, is the most populous city in the United States. With an estimated 2017 population of 8,622,698 distributed over a land area of about 302.6 square miles, New York is the most densely populated major city in the United States. Located at the southern tip of the state of New York, the city is the center of the New York metropolitan area, the largest metropolitan area in the world by urban landmass and one of the world's most populous megacities, with an estimated 20,320,876 people in its 2017 Metropolitan Statistical Area and 23,876,155 residents in its Combined Statistical Area. A global power city, New York City has been described as the cultural and media capital of the world, exerts a significant impact upon commerce, research, education, tourism, art and sports; the city's fast pace has inspired the term New York minute. Home to the headquarters of the United Nations, New York is an important center for international diplomacy.
Situated on one of the world's largest natural harbors, New York City consists of five boroughs, each of, a separate county of the State of New York. The five boroughs – Brooklyn, Manhattan, The Bronx, Staten Island – were consolidated into a single city in 1898; the city and its metropolitan area constitute the premier gateway for legal immigration to the United States. As many as 800 languages are spoken in New York, making it the most linguistically diverse city in the world. New York City is home to more than 3.2 million residents born outside the United States, the largest foreign-born population of any city in the world. In 2017, the New York metropolitan area produced a gross metropolitan product of US$1.73 trillion. If greater New York City were a sovereign state, it would have the 12th highest GDP in the world. New York is home to the highest number of billionaires of any city in the world. New York City traces its origins to a trading post founded by colonists from the Dutch Republic in 1624 on Lower Manhattan.
The city and its surroundings came under English control in 1664 and were renamed New York after King Charles II of England granted the lands to his brother, the Duke of York. New York served as the capital of the United States from 1785 until 1790, it has been the country's largest city since 1790. The Statue of Liberty greeted millions of immigrants as they came to the U. S. by ship in the late 19th and early 20th centuries and is an international symbol of the U. S. and its ideals of liberty and peace. In the 21st century, New York has emerged as a global node of creativity and entrepreneurship, social tolerance, environmental sustainability, as a symbol of freedom and cultural diversity. Many districts and landmarks in New York City are well known, with the city having three of the world's ten most visited tourist attractions in 2013 and receiving a record 62.8 million tourists in 2017. Several sources have ranked New York the most photographed city in the world. Times Square, iconic as the world's "heart" and its "Crossroads", is the brightly illuminated hub of the Broadway Theater District, one of the world's busiest pedestrian intersections, a major center of the world's entertainment industry.
The names of many of the city's landmarks and parks are known around the world. Manhattan's real estate market is among the most expensive in the world. New York is home to the largest ethnic Chinese population outside of Asia, with multiple signature Chinatowns developing across the city. Providing continuous 24/7 service, the New York City Subway is the largest single-operator rapid transit system worldwide, with 472 rail stations. Over 120 colleges and universities are located in New York City, including Columbia University, New York University, Rockefeller University, which have been ranked among the top universities in the world. Anchored by Wall Street in the Financial District of Lower Manhattan, New York has been called both the most economically powerful city and the leading financial center of the world, the city is home to the world's two largest stock exchanges by total market capitalization, the New York Stock Exchange and NASDAQ. In 1664, the city was named in honor of the Duke of York.
James's older brother, King Charles II, had appointed the Duke proprietor of the former territory of New Netherland, including the city of New Amsterdam, which England had seized from the Dutch. During the Wisconsinan glaciation, 75,000 to 11,000 years ago, the New York City region was situated at the edge of a large ice sheet over 1,000 feet in depth; the erosive forward movement of the ice contributed to the separation of what is now Long Island and Staten Island. That action left bedrock at a shallow depth, providing a solid foundation for most of Manhattan's skyscrapers. In the precolonial era, the area of present-day New York City was inhabited by Algonquian Native Americans, including the Lenape, whose homeland, known as Lenapehoking, included Staten Island; the first documented visit into New York Harbor by a European was in 1524 by Giovanni da Verrazzano, a Florentine explorer in the service of the French crown. He named it Nouvelle Angoulême. A Spanish expedition led by captain Estêvão Gomes, a Portuguese sailing for Emperor Charles V, arrived in New York Harbor in January 1525 and charted the mouth of the Hudson River, which he named Río de San Antonio.
The Padrón Rea