1.
Town
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A town is a human settlement larger than a village but smaller than a city. The size definition for what constitutes a town varies considerably in different parts of the world, the word town shares an origin with the German word Zaun, the Dutch word tuin, and the Old Norse tun. The German word Zaun comes closest to the meaning of the word. An early borrowing from Celtic *dunom, in English and Dutch, the meaning of the word took on the sense of the space which these fences enclosed. In England, a town was a community that could not afford or was not allowed to build walls or other larger fortifications. In the Netherlands, this space was a garden, more specifically those of the wealthy, in Old Norse tun means a place between farmhouses, and is still used in a similar meaning in modern Norwegian. If there was any distinction between toun and burgh as claimed by some, it did not last in practice as burghs, for example, Edina Burgh or Edinburgh was built around a fort and eventually came to have a defensive wall. In some cases, town is a name for city or village. Sometimes, the town is short for township. A places population size is not a determinant of urban character. In many areas of the world, as in India at least until recent times, in the United Kingdom, there are historical cities that are far smaller than the larger towns. Some forms of settlement, such as temporary mining locations, may be clearly non-rural. Towns often exist as governmental units, with legally defined borders. In the United States these are referred to as incorporated towns, in other cases the town lacks its own governance and is said to be unincorporated. Note that the existence of a town may be legally set forth through other means. In the case of planned communities, the town exists legally in the form of covenants on the properties within the town. Australian geographer Thomas Griffith Taylor proposed a classification of towns based on their age, although there is no official use of the term for any settlement. In Albanian qytezë means small city or new city, while in ancient times small residential center within the walls of a castle
2.
United States
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Forty-eight of the fifty states and the federal district are contiguous and located 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, the state of Hawaii is an archipelago in the mid-Pacific Ocean. The U. S. territories are scattered about the Pacific Ocean, the geography, climate and wildlife of the country are extremely diverse. At 3.8 million square miles and with over 324 million people, the United States is the worlds third- or fourth-largest country by area, third-largest by land area. It is one of the worlds most ethnically diverse and multicultural nations, paleo-Indians migrated from Asia to the North American mainland at least 15,000 years ago. European colonization began in the 16th century, the United States emerged from 13 British colonies along the East Coast. Numerous disputes between Great Britain and the following the Seven Years War led to the American Revolution. On July 4,1776, during the course of the American Revolutionary War, the war ended in 1783 with recognition of the independence of the United States by Great Britain, representing the first successful war of independence against a European power. The current constitution was adopted in 1788, after the Articles of Confederation, the first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties. During the second half of the 19th century, the American Civil War led to the end of slavery in the country. By the end of century, the United States extended into the Pacific Ocean. The Spanish–American War and World War I confirmed the status as a global military power. The end of the Cold War and the dissolution of the Soviet Union in 1991 left the United States as the sole superpower. The U. S. is a member of the United Nations, World Bank, International Monetary Fund, Organization of American States. The United States is a developed country, with the worlds largest economy by nominal GDP. It ranks highly in several measures of performance, including average wage, human development, per capita GDP. While the U. S. economy is considered post-industrial, characterized by the dominance of services and knowledge economy, the United States is a prominent political and cultural force internationally, and a leader in scientific research and technological innovations. In 1507, the German cartographer Martin Waldseemüller produced a map on which he named the lands of the Western Hemisphere America after the Italian explorer and cartographer Amerigo Vespucci
3.
Arizona
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Arizona is a state in the southwestern region of the United States. It is also part of the Western United States and the Mountain West states and it is the sixth largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix, Arizona is one of the Four Corners states. It has borders with New Mexico, Utah, Nevada, California, and Mexico, Arizonas border with Mexico is 389 miles long, on the northern border of the Mexican states of Sonora and Baja California. Arizona is the 48th state and last of the states to be admitted to the Union. Historically part of the territory of Alta California in New Spain, after being defeated in the Mexican–American War, Mexico ceded much of this territory to the United States in 1848. The southernmost portion of the state was acquired in 1853 through the Gadsden Purchase, Southern Arizona is known for its desert climate, with very hot summers and mild winters. There are ski resorts in the areas of Flagstaff, Alpine, in addition to the Grand Canyon National Park, there are several national forests, national parks, and national monuments. To the European settlers, their pronunciation sounded like Arissona, the area is still known as alĭ ṣonak in the Oodham language. Another possible origin is the Basque phrase haritz ona, as there were numerous Basque sheepherders in the area, There is a misconception that the states name originated from the Spanish term Árida Zona. See also lists of counties, islands, rivers, lakes, state parks, national parks, Arizona is in the Southwestern United States as one of the Four Corners states. Arizona is the sixth largest state by area, ranked after New Mexico, of the states 113,998 square miles, approximately 15% is privately owned. The remaining area is public forest and park land, state trust land, Arizona is well known for its desert Basin and Range region in the states southern portions, which is rich in a landscape of xerophyte plants such as the cactus. This regions topography was shaped by volcanism, followed by the cooling-off. Its climate has hot summers and mild winters. The state is well known for its pine-covered north-central portion of the high country of the Colorado Plateau. Like other states of the Southwest United States, Arizona has an abundance of mountains, despite the states aridity, 27% of Arizona is forest, a percentage comparable to modern-day France or Germany. The worlds largest stand of pine trees is in Arizona
4.
ZIP Code
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ZIP Codes are a system of postal codes used by the United States Postal Service since 1963. The term ZIP, an acronym for Zone Improvement Plan, was chosen to suggest that the travels more efficiently, and therefore more quickly. The basic format consists of five numerical digits, an extended ZIP+4 code, introduced in 1983, includes the five digits of the ZIP Code, a hyphen, and four additional digits that determine a more specific location within a given ZIP Code. The term ZIP Code was originally registered as a servicemark by the U. S. Postal Service, USPS style for ZIP is all caps and the c in code is also capitalized, although style sheets for some publications use sentence case or lowercase. The early history and context of postal codes began with postal district/zone numbers, the United States Post Office Department implemented postal zones for numerous large cities in 1943. For example, Mr. John Smith 3256 Epiphenomenal Avenue Minneapolis 16, by the early 1960s a more organized system was needed, and on July 1,1963, non-mandatory five-digit ZIP Codes were introduced nationwide. Three months later, on October 1,1963, the U. S, an earlier list in June had proposed capitalized abbreviations ranging from two to five letters. The abbreviations have remained unchanged, with one exception, according to the historian of the U. S. Robert Moon, an employee of the post office, is considered the father of the ZIP Code, he submitted his proposal in 1944 while working as a postal inspector. The post office gives credit to Moon only for the first three digits of the ZIP Code, which describe the sectional center facility or sec center, an SCF is a central mail processing facility with those three digits. The SCF sorts mail to all post offices with those first three digits in their ZIP Codes, the mail is sorted according to the final two digits of the ZIP Code and sent to the corresponding post offices in the early morning. Sectional centers do not deliver mail and are not open to the public, Mail picked up at post offices is sent to their own SCF in the afternoon, where the mail is sorted overnight. The United States Post Office used a character, which it called Mr. ZIP. He was often depicted with a such as USE ZIP CODE in the selvage of panes of stamps or on labels contained in, or the covers of. In 1983, the U. S. Postal Service introduced an expanded ZIP Code system that it called ZIP+4, often called plus-four codes, add-on codes, or add ons. But initial attempts to promote use of the new format met with public resistance. For Post Office Boxes, the rule is that each box has its own ZIP+4 code. However, there is no rule, so the ZIP+4 Code must be looked up individually for each box. It is common to use add-on code 9998 for mail addressed to the postmaster,9999 for general delivery, for a unique ZIP Code, the add-on code is typically 0001
5.
Yuma, Arizona
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Yuma is a city in and the county seat of Yuma County, Arizona, United States. It is located in the corner of the state. Yuma is the city of the Yuma, Arizona Metropolitan Statistical Area. According to the United States Census Bureau, the 2014 estimated population of the Yuma MSA is 203,247, more than 85,000 retirees make Yuma their winter residence. The areas first settlers for thousands of years were Native American cultures and their descendants now occupy the Cocopah and Quechan reservations. In 1540, Spanish colonial expeditions under Hernando de Alarcon and Melchior Diaz visited the area, the Colorado River narrows to slightly under 1,000 feet wide in one area. Military expeditions that crossed the Colorado River at the Yuma Crossing include Juan Bautista de Anza, the Mormon Battalion, during and after the California Gold Rush to the late 1870s, the Yuma Crossing was known for its ferry crossings for the Southern Emigrant Trail. This was considered the gateway to California, as it was one of the few spots where travelers could cross the otherwise very wide Colorado River. Following the United States establishing Fort Yuma, two towns developed one mile down river, the one on the California side was called Jaeger City, named after the owner of Jaegers Ferry, which crossed the river there. It was for a time the larger of the two, with the Butterfield Overland Mail office and station, two blacksmiths, a hotel, two stores, and other dwellings, the other was called Colorado City. Developed on the side of the river in what is now Arizona by speculator Charles Poston. When started, it was just north of the border between Mexican-ruled Sonora, Mexico and California, after the Gadsden Purchase by the United States, the town bordered on the Territory of New Mexico. This area was designated as the Territory of Arizona in 1863, the county of San Diego collected taxes from there for many years. From 1853 a smaller settlement, Arizona City, grew up on the ground across from the fort and was organized under the name of its post office in 1858. It had adobe dwellings, two stores and two saloons, Colorado City and Jaeger City were almost completely destroyed by the Great Flood of 1862 and had to be rebuilt on higher ground. At that time Colorado City became part of Arizona City and it took the name Yuma in 1873. From 1854, Colorado City was the major stop for traffic up. After the 1862 flood, it part of Arizona City
6.
Interstate 8
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Interstate 8 is an Interstate Highway in the southwestern United States. It runs from the edge of Mission Bay at Sunset Cliffs Boulevard in San Diego, California, almost at the Pacific Ocean, to the junction with I-10, just southeast of Casa Grande. Crossing the Colorado River into Arizona, I-8 continues through the city of Yuma across the Sonoran Desert to Casa Grande and these were later replaced by U. S. Route 80 across California and part of Arizona, and Arizona State Route 84 between Gila Bend and Casa Grande. The Arizona portion of the road was starting in the 1960s. The route was completed in 1975 through California, and by 1977 through Arizona, I-8 is part of the National Highway System, a network of roadways important to the countrys economy, defense, and mobility. The freeway begins at the intersection of Sunset Cliffs Boulevard and Nimitz Boulevard in San Diego, for its first few miles, it parallels the San Diego River floodway. Near Old Town San Diego, I-8 intersects with I-5 as well as with Rosecrans Avenue, as the freeway enters Mission Valley, it continues eastward, bisecting the area known as Hotel Circle that has several hotels. I-8 then has interchanges with SR163, I-805, and I-15 and its continuation, SR15, in La Mesa, the route intersects SR125. The freeway intersects with SR79 in the national forest before passing through the La Posta, in Boulevard, I-8 has an interchange with the eastern end of SR94. I-8 straddles the San Diego—Imperial county line for a few miles before turning east, at the Mountain Springs/In Ko Pah grade, the freeway is routed down two separate canyons, as it descends 4,000 feet in 11 miles. In places, the median is over 1.5 miles wide, the route enters the Imperial Valley, where it intersects with SR98, a highway leading to Calexico, and passes near the Desert View Tower. I-8 then goes through Coyote Wells before entering the city of El Centro several miles later, in El Centro, I-8 intersects with SR86 and SR111, both north–south routes which connect to I-10 in the Coachella Valley, north of the Salton Sea. SR115 and SR98 end at I-8 east of El Centro, the route also has the lowest above-ground elevation of any Interstate at 52 feet below sea level near El Centro. The freeway then traverses the Imperial Sand Dunes Recreation Area and intersects with SR186 leading south to Baja California Norte, I-8 runs parallel to the All-American Canal across the desert for roughly 55 miles. At points in eastern Imperial County, the Mexican border is less than half a mile south of the Interstate, I-8 then passes through Felicity and Winterhaven before crossing the Colorado River on a bridge into Yuma, Arizona. It is officially known as the Border Friendship Route from San Diego to the Arizona state line, the Interstate is signed as the Ocean Beach Freeway west of I-5. Between Old Town and El Cajon, I-8 is called the Mission Valley Freeway, I-8 enters Arizona from California at the Colorado River bridge at Yuma. It initially heads south through Yuma until the interchange with US95, west of Wellton, the highway takes a northeasterly course, paralleling the Gila River and passing to the south of Roll
7.
U.S. Route 80 in Arizona
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U. S. Route 80 is an east–west United States Numbered Highway, much of which was once part of the early auto trail known as the Dixie Overland Highway. As the 0 in the number indicates, it was originally a cross-country route. However, the segment west of Dallas, Texas, has been decommissioned in favor of various Interstate Highways. Currently, the western terminus is at an interchange with Interstate 30 on the Dallas–Mesquite. The highways eastern terminus is in Tybee Island, Georgia, at the intersection of Butler Avenue, Inlet Avenue, modern US80 begins as a significant component of the urban freeway system of Dallas, Texas. With Spur 557, it serves as the shortest freeway route from the central and northern portions of Dallas to I-20, heading east towards Shreveport and it rejoins I-20 for about five miles, before splitting to pass through downtown Waskom before crossing into Louisiana. US80 is parallel to the newer I-20, which has supplanted it as a long-distance route, the highway crosses the state line from Texas into Caddo Parish as a two-lane road and crosses over to the south of I-20 without connecting with the freeway. It passes through the town of Greenwood where it meets US79 coming north from Texas, US 79/US80 crosses over I-20 again, this time at an interchange, and enters the city of Shreveport as Greenwood Road. US171 ends at US 79/US80 at the intersection with Hearne Avenue, at this intersection, the road narrows to two through lanes. US80 intersects I-20 again just east of here, at Mansfield Road, the highway name changes to Texas Avenue and angles northeast through an industrial area. The road skirts the I-20/I-49 interchange and expands to four lanes for its approach to downtown. US 79/US80 passes through downtown Shreveport on Texas Street before crossing the Red River on the 1930s vintage Long–Allen Bridge and entering Bossier City, through Bossier Parish, US 79/US80 comprises a major urban and suburban arterial carrying a minimum of four lanes. In the eastern reaches of the parish, and continuing into Webster Parish, the road intersects the east end of I-220 at an interchange. US 79/US80 stays to the north of I-20, except for a stretch east of Haughton where it strays to the south for a period, at Dixie Inn, the highway intersects US371. In Minden, US79 separates from US80 and continues its northeasterly trajectory toward Arkansas, East of Minden, US80 crosses to the south of I-20 and serves the Bienville Parish towns of Gibsland and Arcadia. Entering Lincoln Parish, the highway serves Simsboro and Grambling before entering Ruston, US80 resumes its eastward path on the north side of Ruston and exits the city on East Georgia Avenue. Between Ruston and Monroe the highway serves the communities of Choudrant. Now on the side of the interstate, it enters Ouachita Parish
8.
Union Pacific Railroad
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The Union Pacific Railroad is a freight hauling railroad that operates 8,500 locomotives over 32,100 route-miles in 23 states west of Chicago, Illinois and New Orleans, Louisiana. The Union Pacific Railroad network is the largest in the United States and it is also one of the worlds largest transportation companies. Union Pacific Railroad is the operating company of Union Pacific Corporation. Union Pacific Corporations main competitor is the BNSF Railway, the second largest freight railroad. Together, the two railroads have a duopoly on all freight rail lines in the U. S. The original company was incorporated on July 1,1862, under an act of Congress entitled Pacific Railroad Act of 1862. The act was approved by President Abraham Lincoln, and it provided for the construction of railroads from the Missouri River to the Pacific as a war measure for the preservation of the Union. It was constructed westward from Council Bluffs, Iowa to meet the Central Pacific Railroad line, the line was constructed primarily by Irish labor who had learned their craft during the recent Civil War. The two lines were joined together at Promontory Summit, Utah,53 miles west of Ogden on May 10,1869, hence creating the first transcontinental railroad in North America. Under the guidance of its dominant stockholder Dr. Thomas Clark Durant, the namesake of the city of Durant, Iowa, the first rails were laid in Omaha. It built or purchased local lines that gave it access to Denver, Colorado, to Portland, Oregon and it also owned narrow gauge trackage into the heart of the Colorado Rockies and a standard gauge line south from Denver across New Mexico into Texas. UP was entangled in the Crédit Mobilier scandal, exposed in 1872 and its independent construction company the Crédit Mobilier had bribed congressmen. The UP itself was not guilty but it did get bad publicity, the financial crisis of 1873 led to financial troubles but not bankruptcy. The company was reorganized as the Union Pacific Railway on January 24,1880, the new company declared bankruptcy during the Panic of 1893. When it emerged in 1897 it reverted to the original name, the corporate headquarters of the Union Pacific Corporation were located in New York City from its initial founding in the 1860s until Drew Lewis became CEO in the mid-1980s. He relocated it to Bethlehem, Pennsylvania, later the headquarters was shifted to Dallas, Texas, before relocating to Omaha to join the operating headquarters. From the ICC annual reports, except 1979 is from Moodys, on December 31,1925 UP-OSL-OWRN-LA&SL-StJ&GI operated 9,834 route-miles and 15,265 track-miles. At the end of 1980, Union Pacific operated 9,266 route-miles and 15,647 miles of track, Moodys shows 220,697 million revenue ton-miles in 1993 on the expanded system
9.
Southern Pacific Transportation Company
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The Southern Pacific Transportation Company, earlier Southern Pacific Railroad and Southern Pacific Company, and usually called the Southern Pacific or Espee, was an American Class I railroad. It was absorbed in 1988 by the company controlled the Denver and Rio Grande Western Railroad. The railroad was founded as a holding company in 1865. By 1900 the Southern Pacific Company was a railroad system incorporating many smaller companies, such as the Texas and New Orleans Railroad and Morgans Louisiana. It extended from New Orleans through Texas to El Paso, across New Mexico and through Tucson, to Los Angeles, through most of California, including San Francisco, Central Pacific lines extended east across Nevada to Ogden, Utah, and reached north through Oregon to Portland. By the 1980s route mileage had dropped to 10,423 miles, in 1988 the Southern Pacific was taken over by D&RGW parent Rio Grande Industries. The combined railroad kept the Southern Pacific name due to its recognition in the railroad industry. Along with the addition of the SPCSL Corporation route from Chicago to St. Louis, by 1996 years of financial problems had dropped SPs mileage to 13,715 miles, and it was taken over by the Union Pacific Railroad. Southern Pacific founded important hospitals in San Francisco, Tucson, in the 1970s, it also founded a telecommunications network with a state-of-the-art microwave and fiber optic backbone. This evolved into Sprint, a company name that came from the acronym for Southern Pacific Railroad Internal Networking Telephony. The original aim was to construct a railroad from Galveston Bay to a point on the Red River near a trading post known as Coffees Station, the GRR built 2 miles of track in Houston in 1855. Track laying began in earnest in 1856 and on 1 September 1856 GRR was renamed the Houston and Texas Central Railway. SP acquired H&TC in 1883 but it continued to operate as a subsidiary under its own management until 1927, when it was leased to another SP-owned railroad, the Texas and New Orleans Railroad. The Buffalo Bayou, Brazos and Colorado Railway, was chartered in Texas on 11 February 1850 by a group that included General Sidney Sherman, bBB&C was the first railroad to commence operation in Texas and the first component of SP to commence operation. Surveying of the route alignment commenced at Harrisburg, Texas in 1851, the first 20 miles of track opened in August 1853. SP was founded in San Francisco, California in 1865 by a group of businessmen led by Timothy Phelps with the aim of building a connection between San Francisco and San Diego, California. The company was purchased in September 1868 by a group of known as the Big Four, Charles Crocker, Leland Stanford, Mark Hopkins. The Big Four had, in 1861, created the Central Pacific Railroad, CPRR was merged into SP in 1870
10.
Sunset Limited
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The Sunset Limited is a passenger train that for most of its history has run between New Orleans, Louisiana, and Los Angeles, California, over the nations second transcontinental route. Both passenger totals and revenues have shown an improvement in recent years. During fiscal year 2014, the Sunset Limited carried 105,000 passengers, but held back by running only three days a week, the Sunset Limited carried the fewest passengers of any Amtrak train. For FY2014, it had a revenue of $12,598,000. West of New Orleans, the route was owned by the Southern Pacific Railroad and is now owned by the BNSF Railway, the name Sunset Limited traces its origins to the Galveston, Harrisburg and San Antonio Railway, which was known as the Sunset Route as early as 1874. On the portion of the route east of New Orleans, service was suspended after Hurricane Katrina, currently, the segment of the former Atlantic Coast Line Railroad between DeLand and Orlando is owned by Central Florida Rail Corridor as of 2014. The train uses the following segments, identified here by the names of their original owners. The rail line in the path of Hurricane Katrina east of New Orleans was washed out, the operating railroad CSX restored the line itself between New Orleans and Jacksonville. However, at the time in 2006 Amtrak said it was deemed too expensive to rebuild to modern passenger rail standards, Amtrak identifies the route as suspended. In 2016 Amtrak has proposed to return the Sunset Limited back into Florida in the near future, at San Antonio, the Sunset Limited train and Texas Eagle thru-cars are combined for the journey westward and split eastward. A highlight of the trip is the crossing of the Huey P, long Bridge just west of New Orleans. The bridge is one of the longest railroad bridges in the United States, at 4.5 miles, before the start of Amtrak on May 1,1971, the Sunset Limited was operated by the Southern Pacific Railroad. The Sunset Limited is the oldest named train in the United States, operating since November 1894, the Sunset Route is the southernmost of the three gateways to the West Coast, envisioned through the Transcontinental Railroad Act. The other two were Chicago IL, and St. Louis, MO, the Sunset Limited was Southern Pacifics premier train. Initially the Sunset Limited was a train, with sleeping cars and no coaches. From its beginning in 1894 until streamlining in 1950, all the cars had 6-wheel trucks and dark olive green paint with black roofs. In summer 1926 it was scheduled at 71 hr 40 min New Orleans to San Francisco, in 1936 the train resumed running to San Francisco and was one of SPs first trains to receive air-conditioning. In January 1942 it was cut back to Los Angeles, the Sunset Limited was never again all-Pullman, the train was dieselized in late 1949 and became a streamliner in August 1950
11.
Marriage
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The definition of marriage varies according to different cultures, but it is principally an institution in which interpersonal relationships, usually sexual, are acknowledged. In some cultures, marriage is recommended or considered to be compulsory before pursuing any sexual activity, when defined broadly, marriage is considered a cultural universal. Individuals may marry for several reasons, including legal, social, libidinal, emotional, financial, spiritual, whom they marry may be influenced by socially determined rules of incest, prescriptive marriage rules, parental choice and individual desire. In some areas of the world, arranged marriage, child marriage, polygamy, conversely, such practices may be outlawed and penalized in parts of the world out of concerns for womens rights and because of international law. These trends coincide with the human rights movement. Marriage can be recognized by a state, an organization, an authority, a tribal group. It is often viewed as a contract, Marriages can be performed in a secular civil ceremony or in a religious setting via a wedding ceremony. The act of marriage usually creates normative or legal obligations between the individuals involved, and any offspring they may produce, some cultures allow the dissolution of marriage through divorce or annulment. In some areas, child marriages and polygamy may occur in spite of laws against the practice. For example, the number of marriages in Europe decreased by 30% from 1975 to 2005 and these changes have occurred primarily in Western countries. The word marriage derives from Middle English mariage, which first appears in 1250–1300 CE and this in turn is derived from Old French, marier, and ultimately Latin, marītāre, meaning to provide with a husband or wife and marītāri meaning to get married. The adjective marīt-us -a, -um meaning matrimonial or nuptial could also be used in the form as a noun for husband. Anthropologists have proposed several competing definitions of marriage in an attempt to encompass the wide variety of marital practices observed across cultures, even within Western culture, definitions of marriage have careened from one extreme to another and everywhere in between. The anthropological handbook Notes and Queries defined marriage as a union between a man and a such that children born to the woman are the recognized legitimate offspring of both partners. In recognition of a practice by the Nuer people of Sudan allowing women to act as a husband in certain circumstances, Kathleen Gough suggested modifying this to a woman, none of these men had legal rights to the womans child. Economic anthropologist Duran Bell has criticized the definition on the basis that some societies do not require marriage for legitimacy. He argued that a definition of marriage is circular in societies where illegitimacy has no other legal or social implications for a child other than the mother being unmarried. In 1955 article in Man, Leach argued that no one definition of marriage applied to all cultures and he offered a list of ten rights associated with marriage, including sexual monopoly and rights with respect to children, with specific rights differing across cultures
12.
Population density
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Population density is a measurement of population per unit area or unit volume, it is a quantity of type number density. It is frequently applied to living organisms, and most of the time to humans and it is a key geographical term. Population density is population divided by land area or water volume. Low densities may cause a vortex and lead to further reduced fertility. This is called the Allee effect after the scientist who identified it, commonly this may be calculated for a county, city, country, another territory, or the entire world. The worlds population is around 7,000,000,000, therefore, the worldwide human population density is around 7,000,000,000 ÷510,000,000 =13.7 per km2. If only the Earths land area of 150,000,000 km2 is taken into account and this includes all continental and island land area, including Antarctica. If Antarctica is also excluded, then population density rises to over 50 people per km2, thus, this number by itself does not give any helpful measurement of human population density. Several of the most densely populated territories in the world are city-states, microstates, cities with high population densities are, by some, considered to be overpopulated, though this will depend on factors like quality of housing and infrastructure and access to resources. Most of the most densely populated cities are in Southeast Asia, though Cairo, for instance, Milwaukee has a greater population density when just the inner city is measured, and the surrounding suburbs excluded. Arithmetic density, The total number of people / area of land, physiological density, The total population / area of arable land. Agricultural density, The total rural population / area of arable land, residential density, The number of people living in an urban area / area of residential land. Urban density, The number of people inhabiting an urban area / total area of urban land, ecological optimum, The density of population that can be supported by the natural resources. S. States by population density Selected Current and Historic City, Ward & Neighborhood Density
