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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
2.
High-rise building
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A tower block, high-rise, apartment tower, residential tower, apartment block, block of flats, or office tower is a tall building or structure used as a residential and/or office building. In some areas it may be referred to as an MDU, in the United States, such a structure is referred to as an apartment building or office building, while a group of such buildings is called an apartment complex or office complex. High-rise buildings became possible with the invention of the elevator and cheaper, the materials used for the structural system of high-rise buildings are reinforced concrete and steel. Most North American style skyscrapers have a frame, while residential blocks are usually constructed of concrete. There is no difference between a tower block and a skyscraper, although a building with fifty or more stories is generally considered a skyscraper. They also pose challenges to firefighters during emergencies in high-rise structures. Studies are often required to ensure that pedestrian wind comfort and wind danger concerns are addressed, in order to allow less wind exposure, to transmit more daylight to the ground and to appear more slender, many high-rises have a design with setbacks. In contrast with low-rise and single-family houses, apartment blocks accommodate more inhabitants per unit of area of land, various bodies have defined high-rise, Emporis Standards defines a high-rise as A multi-story structure between 35–100 meters tall, or a building of unknown height from 12–39 floors. According to the code of Hyderabad, India, a high-rise building is one with four floors or more. The New Shorter Oxford English Dictionary defines a high-rise as a building having many storeys, most building engineers, inspectors, architects and similar professionals define a high-rise as a building that is at least 75 feet tall. The lower floors were occupied by either shops or wealthy families. Surviving Oxyrhynchus Papyri indicate that seven-story buildings even existed in provincial towns, in Arab Egypt, the initial capital city of Fustat housed many high-rise residential buildings, some seven stories tall that could reportedly accommodate hundreds of people. By the 16th century, Cairo also had high-rise apartment buildings where the two floors were for commercial and storage purposes and the multiple stories above them were rented out to tenants. The skyline of many important medieval cities was dominated by large numbers of high-rising urban towers, the residential Towers of Bologna numbered between 80 and 100 at a time, the largest of which still rise to 97.2 m. In Florence, a law of 1251 decreed that all buildings should be reduced to a height of less than 26 m. Even medium-sized towns such as San Gimignano are known to have featured 72 towers up to 51 m in height, the oldest still standing tulou dates back from the 14th century. Tower blocks were built in the Yemeni city of Shibam in the 16th century. The houses of Shibam are all out of mud bricks, but about five hundred of them are tower houses
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Facade
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A façade is generally one exterior side of a building, usually, but not always, the front. It is a loan word from the French façade, which means frontage or face. In architecture, the façade of a building is often the most important aspect from a design standpoint, from the engineering perspective of a building, the façade is also of great importance due to its impact on energy efficiency. For historical façades, many local zoning regulations or other laws restrict or even forbid their alteration. The word comes from the French foreign loan word façade, which in turn comes from the Italian facciata, from faccia meaning face, the earliest usage recorded by the Oxford English Dictionary is 1656. It was quite common in the Georgian period for existing houses in English towns to be given a fashionable new façade, in modern highrise building, the exterior walls are often suspended from the concrete floor slabs. Examples include curtain walls and precast concrete walls, the façade can at times be required to have a fire-resistance rating, for instance, if two buildings are very close together, to lower the likelihood of fire spreading from one building to another. In general, the systems that are suspended or attached to the precast concrete slabs will be made from aluminium or stainless steel. In recent years more lavish materials such as titanium have sometimes been used, whether rated or not, fire protection is always a design consideration. The melting point of aluminium,660 °C, is reached within minutes of the start of a fire. Firestops for such building joints can be qualified, too, putting fire sprinkler systems on each floor has a profoundly positive effect on the fire safety of buildings with curtain walls. Some building codes also limit the percentage of area in exterior walls. When the exterior wall is not rated, the slab edge becomes a junction where rated slabs are abutting an unrated wall. For rated walls, one may also choose rated windows and fire doors, on a film set and within most themed attractions, many of the buildings are only façades, which are far cheaper than actual buildings, and not subject to building codes. In film sets, they are held up with supports from behind. Within theme parks, they are usually decoration for the interior ride/attraction/restaurant, by Ulrich Knaack, Tillmann Klein, Marcel Bilow and Thomas Auer. ISBN 978-3-7643-7961-2 ISBN 978-3-7643-7962-9 Giving buildings an illusion of grandeur Poole, the article outlines the development of the façade in ecclesiastical architecture from the early Christian period to the Renaissance
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Beaux-Arts architecture
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Beaux-Arts architecture expresses the academic neoclassical architectural style taught at the École des Beaux-Arts in Paris. The style of instruction that produced Beaux-Arts architecture continued without interruption until 1968. The Beaux-Arts style heavily influenced the architecture of the United States in the period from 1880 to 1920, in contrast, many European architects of the period 1860–1914 outside France gravitated away from Beaux-Arts and towards their own national academic centers. American architects of the Beaux-Arts generation often returned to Greek models, for the first time, repertories of photographs supplemented meticulous scale drawings and on-site renderings of details. Beaux-Arts training emphasized the production of quick conceptual sketches, highly finished perspective presentation drawings, close attention to the program, site considerations tended toward social and urbane contexts. In the façade shown to the right, Diana grasps the cornice she sits on in an action typical of Beaux-Arts integration of sculpture with architecture. A sense of appropriate idiom at the craftsman level supported the teams of the first truly modern architectural offices. The prestige of the École gave the style Beaux-Arts a second wind in combining the new manner with the traditional training and they were followed by an entire generation. Henry Hobson Richardson absorbed Beaux-Arts lessons in massing and spatial planning and his Beaux-Arts training taught him to transcend slavish copying and recreate in the essential fully digested and idiomatic manner of his models. Richardson evolved a personal style freed of historicism that was influential in early Modernism. The White City of the Worlds Columbian Exposition of 1893 in Chicago was a triumph of the movement, the Beaux-Arts curriculum was subsequently begun at Columbia University, the University of Pennsylvania, and elsewhere. From 1916, the Beaux-Arts Institute of Design in New York City schooled architects, painters, bosworth, Carnegie Mellon University, designed by Henry Hornbostel, and the University of Texas, designed by Paul Philippe Cret. Beaux-Arts architecture also brought a civic face to the railroad, two of the best American examples of the Beaux-Arts tradition stand within a few blocks of each other, Grand Central Terminal and the New York Public Library. Another prominent U. S. example of the style is the largest academic dormitory in the world, in the late 1800s, during the years when Beaux-Arts architecture was at a peak in France, Americans were one of the largest groups of foreigners in Paris. Many of them were architects and students of architecture who brought this back to America. Beaux-Arts was very prominent in public buildings in Canada in the early 20th century, notably all three prairie provinces legislative buildings are in this style. Buenos Aires is a center of Beaux-Arts architecture which continued to be built as late as the 1950s, national Theatre, Melbourne General Post Office building, Forrest Place, Perth Argus Building. Beaux-Arts Architecture in New York, A Photographic Guide United States, sixteenth Street Architecture – profiles of Beaux-Arts architecture in Washington D. C
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Modern architecture
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Modern architecture or modernist architecture is a term applied to a group of styles of architecture which emerged in the first half of the 20th century and became dominant after World War II. The revolution in materials came first, with the use of cast iron, plate glass, the cast plate glass process was invented in 1848, allowing the manufacture of very large windows. The Crystal Palace by Joseph Paxton at the Great Exhibition of 1851 was an example of iron and plate glass construction, followed in 1864 by the first glass. These developments together led to the first steel-framed skyscraper, the ten-story Home Insurance Building in Chicago, the iron frame construction of the Eiffel Tower, then the tallest structure in the world, captured the imagination of millions of visitors to the 1889 Paris Universal Exposition. French industrialist François Coignet was the first to use iron-reinforced concrete, in 1853 Coignet built the first iron reinforced concrete structure, a four story house in the suburbs of Paris. Another important technology for the new architecture was electric light, which reduced the inherent danger of fires caused by gas in the 19th century. This break with the past was particularly urged by the architectural theorist, for each function its material, for each material its form and its ornament. This book influenced a generation of architects, including Louis Sullivan, Victor Horta, Hector Guimard, at the end of the 19th century, a few architects began to challenge the traditional Beaux Arts and Neoclassical styles that dominated architecture in Europe and the United States. The Glasgow School of Art 1896-99) designed by Charles Rennie MacIntosh, had a facade dominated by large bays of windows. The Art Nouveau style was launched in the 1890s by Victor Horta in Belgium and Hector Guimard in France, it introduced new styles of decoration, based on vegetal and floral forms. In 1903-1904 in Paris Auguste Perret and Henri Sauvage began to use reinforced concrete, previously used for industrial structures. Between 1910 and 1913, Auguste Perret built the Théâtre des Champs-Élysées, because of the concrete construction, no columns blocked the spectators view of the stage. Otto Wagner, in Vienna, was another pioneer of the new style, in his book Moderne Arkchtekture he had called for a more rationalist style of architecture, based on modern life. Wagner declared his intention to express the function of the building in its exterior, the reinforced concrete exterior was covered with plaques of marble attached with bolts of polished aluminum. The interior was purely functional and spare, an open space of steel, glass. The Viennese architect Adolf Loos also began removing any ornament from his buildings and his Steiner House, in Vienna, was an example of what he called rationalist architecture, it had a simple stucco rectangual facade with square windows and no ornament. The fame of the new movement, which known as the Vienna Secession spread beyond Austria. Josef Hoffmann, a student of Wagner, constructed a landmark of early modernist architecture and this residence, built of brick covered with Norwegian marble, was composed of geometric blocks, wings and a tower
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Glass
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Glass is a non-crystalline amorphous solid that is often transparent and has widespread practical, technological, and decorative usage in, for example, window panes, tableware, and optoelectronics. The most familiar, and historically the oldest, types of glass are silicate glasses based on the chemical compound silica, the primary constituent of sand. The term glass, in usage, is often used to refer only to this type of material. Many applications of silicate glasses derive from their optical transparency, giving rise to their use as window panes. Glass can be coloured by adding metallic salts, and can also be painted and printed with vitreous enamels and these qualities have led to the extensive use of glass in the manufacture of art objects and in particular, stained glass windows. Although brittle, silicate glass is extremely durable, and many examples of glass fragments exist from early glass-making cultures, because glass can be formed or moulded into any shape, it has been traditionally used for vessels, bowls, vases, bottles, jars and drinking glasses. In its most solid forms it has also used for paperweights, marbles. Some objects historically were so commonly made of glass that they are simply called by the name of the material, such as drinking glasses. Porcelains and many polymer thermoplastics familiar from everyday use are glasses and these sorts of glasses can be made of quite different kinds of materials than silica, metallic alloys, ionic melts, aqueous solutions, molecular liquids, and polymers. For many applications, like glass bottles or eyewear, polymer glasses are a lighter alternative than traditional glass, silica is a common fundamental constituent of glass. In nature, vitrification of quartz occurs when lightning strikes sand, forming hollow, fused quartz is a glass made from chemically-pure SiO2. It has excellent resistance to shock, being able to survive immersion in water while red hot. However, its high melting-temperature and viscosity make it difficult to work with, normally, other substances are added to simplify processing. One is sodium carbonate, which lowers the transition temperature. The soda makes the glass water-soluble, which is undesirable, so lime, some magnesium oxide. The resulting glass contains about 70 to 74% silica by weight and is called a soda-lime glass, soda-lime glasses account for about 90% of manufactured glass. Most common glass contains other ingredients to change its properties, lead glass or flint glass is more brilliant because the increased refractive index causes noticeably more specular reflection and increased optical dispersion. Adding barium also increases the refractive index, iron can be incorporated into glass to absorb infrared energy, for example in heat absorbing filters for movie projectors, while cerium oxide can be used for glass that absorbs UV wavelengths
7.
Granite
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Granite is a common type of felsic intrusive igneous rock that is granular and phaneritic in texture. Granites can be white, pink, or gray in color. The word granite comes from the Latin granum, a grain, in reference to the structure of such a holocrystalline rock. By definition, granite is a rock with at least 20% quartz. The term granitic means granite-like and is applied to granite and a group of igneous rocks with similar textures and slight variations in composition. Occasionally some individual crystals are larger than the groundmass, in case the texture is known as porphyritic. A granitic rock with a texture is known as a granite porphyry. Granitoid is a general, descriptive field term for lighter-colored, coarse-grained igneous rocks, petrographic examination is required for identification of specific types of granitoids. The extrusive igneous rock equivalent of granite is rhyolite, Granite is nearly always massive, hard and tough, and therefore it has gained widespread use throughout human history, and more recently as a construction stone. The average density of granite is between 2.65 and 2.75 g/cm3, its compressive strength usually lies above 200 MPa, and its viscosity near STP is 3–6 •1019 Pa·s. The melting temperature of dry granite at ambient pressure is 1215–1260 °C, it is reduced in the presence of water. Granite has poor primary permeability, but strong secondary permeability, true granite according to modern petrologic convention contains both plagioclase and alkali feldspars. When a granitoid is devoid or nearly devoid of plagioclase, the rock is referred to as alkali feldspar granite, when a granitoid contains less than 10% orthoclase, it is called tonalite, pyroxene and amphibole are common in tonalite. A granite containing both muscovite and biotite micas is called a binary or two-mica granite, two-mica granites are typically high in potassium and low in plagioclase, and are usually S-type granites or A-type granites. A worldwide average of the composition of granite, by weight percent, based on 2485 analyses. Much of it was intruded during the Precambrian age, it is the most abundant basement rock that underlies the relatively thin veneer of the continents. Outcrops of granite tend to form tors and rounded massifs, granites sometimes occur in circular depressions surrounded by a range of hills, formed by the metamorphic aureole or hornfels. Granite often occurs as small, less than 100 km² stock masses
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Limestone
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Limestone is a sedimentary rock, composed mainly of skeletal fragments of marine organisms such as coral, forams and molluscs. Its major materials are the minerals calcite and aragonite, which are different crystal forms of calcium carbonate, about 10% of sedimentary rocks are limestones. The solubility of limestone in water and weak acid solutions leads to karst landscapes, most cave systems are through limestone bedrock. The first geologist to distinguish limestone from dolomite was Belsazar Hacquet in 1778, like most other sedimentary rocks, most limestone is composed of grains. Most grains in limestone are skeletal fragments of organisms such as coral or foraminifera. Other carbonate grains comprising limestones are ooids, peloids, intraclasts and these organisms secrete shells made of aragonite or calcite, and leave these shells behind when they die. Limestone often contains variable amounts of silica in the form of chert or siliceous skeletal fragment, some limestones do not consist of grains at all, and are formed completely by the chemical precipitation of calcite or aragonite, i. e. travertine. Secondary calcite may be deposited by supersaturated meteoric waters and this produces speleothems, such as stalagmites and stalactites. Another form taken by calcite is oolitic limestone, which can be recognized by its granular appearance, the primary source of the calcite in limestone is most commonly marine organisms. Some of these organisms can construct mounds of rock known as reefs, below about 3,000 meters, water pressure and temperature conditions cause the dissolution of calcite to increase nonlinearly, so limestone typically does not form in deeper waters. Limestones may also form in lacustrine and evaporite depositional environments, calcite can be dissolved or precipitated by groundwater, depending on several factors, including the water temperature, pH, and dissolved ion concentrations. Calcite exhibits a characteristic called retrograde solubility, in which it becomes less soluble in water as the temperature increases. Impurities will cause limestones to exhibit different colors, especially with weathered surfaces, Limestone may be crystalline, clastic, granular, or massive, depending on the method of formation. Crystals of calcite, quartz, dolomite or barite may line small cavities in the rock, when conditions are right for precipitation, calcite forms mineral coatings that cement the existing rock grains together, or it can fill fractures. Travertine is a banded, compact variety of limestone formed along streams, particularly there are waterfalls. Calcium carbonate is deposited where evaporation of the leaves a solution supersaturated with the chemical constituents of calcite. Tufa, a porous or cellular variety of travertine, is found near waterfalls, coquina is a poorly consolidated limestone composed of pieces of coral or shells. During regional metamorphism that occurs during the building process, limestone recrystallizes into marble
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Watergate complex
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The Watergate complex is a group of five buildings in the Foggy Bottom neighborhood of Washington, D. C. in the United States. Covering a total of 10 acres next to the John F, the complex has been sold several times since the 1980s. In the 1990s, it was split up and its component buildings, the investigation into the burglary revealed that high officials in the Nixon administration had ordered the break-in and then tried to cover up their involvement. The ensuing Watergate scandal, named for the complex, led to Nixons resignation on August 9,1974, the name Watergate and the suffix -gate have since become synonymous with political scandals in the United States and elsewhere. The Watergate superblock is bounded on the north by Virginia Avenue, on the east by New Hampshire Avenue, on the south by F Street and it is in the Foggy Bottom neighborhood overlooking the Potomac River, next to the Kennedy Center and the embassy of Saudi Arabia. The nearest Metro station,0.4 miles distant, is Foggy Bottom-GWU, Gas production ceased at the site in 1947, and the plant was demolished shortly thereafter. C. The name Watergate relates to numerous aspects of its physical and historical context, the complex sits near the eastern terminus of the Chesapeake and Ohio Canal, which operated from 1831 to 1924 and is now a National Historical Park. A large wooden water gate marks the point where the canal meets the Potomac River, land once owned by the canal company was part of the 10-acre site purchased in 1960 by the projects developer, Rome-based Società Generale Immobiliare. Another namesake is the restaurant, the Water Gate Inn. Instead, beginning in 1935, the steps faced a floating stage on the Potomac River on which open-air concerts were held. Up to 12,000 people would sit on the steps and surrounding grass and listen to symphonies, military bands, the music venue was depicted in scenes in the motion pictures Houseboat and Born Yesterday. The barge concerts ended in 1965 when jet service began at National Airport. The Watergate complex was developed by the Italian firm SGI, the company purchased the 10 acres that belonged to the defunct Chesapeake and Ohio Canal in February 1960 for $10 million. The project was announced on October 21,1960, Italian Luigi Moretti of the University of Rome was the chief architect, and Milton Fischer of the D. C. -based firm of Corning, Moore, Elmore and Fischer the associate architect. The apartment buildings included two-story units on the first and second floors, the design for the entire complex also envisioned an electronic security system so extensive that the press claimed intruders will have difficulty getting onto the grounds undetected. Boris V. Timchenko, a noted D. C, landscape features such as planters would also be used to create privacy barriers between apartments. The complex was the first mixed-use development in the District of Columbia, the Watergate complex was intended to be a city within a city, and provide so many amenities that residents would not need to leave. At the time, it was also the largest renewal effort in the District of Columbia undertaken solely with private funds, the Watergates curved structures were designed to emulate two nearby elements
10.
Parking space
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A parking space is a location that is designated for parking, either paved or unpaved. Parking spaces can be in a garage, in a parking lot or on a city street. It is usually a space delineated by road surface markings, the automobile fits inside the space, either by parallel parking, perpendicular parking or angled parking. Depending on the location of the space, there can be regulations regarding the time allowed to park. When the demand for spaces outstrips supply vehicles may overspill park onto the sidewalk, grass verges, for most motorised vehicles, there are three commonly used arrangements of parking spaces — parallel parking, perpendicular parking, and angle parking. These are self-park configurations where the driver is able to access the parking independently. With parallel parking of cars, these are arranged in a line and this is done parallel to a curb, when one is provided. Parallel parking is the most common mode of streetside parking for cars and it may also be used in parking lots and parking structures, but usually only to supplement parking spaces that use the other modes. With perpendicular parking, also known as bay parking, cars are parked side to side, perpendicular to an aisle, curb, or wall. This type of car parking fits more cars per length of road than parallel parking, often, in car parking lots using perpendicular parking, two rows of parking spaces may be arranged front to front, with aisles in between. If no other cars are blocking, a driver may perform a pullthrough by driving through one parking space into the space to avoid having to reverse out of a parking space upon their return. Sometimes, a row of perpendicular car parking spaces is marked in the center of a street. This arrangement eliminates reversing from the manoeuvre, cars are required to drive in forwards, angle parking, known as echelon parking in Britain, is similar to perpendicular parking for these vehicles, except that cars are arranged at an angle to the aisle. The gentler turn allows easier and quicker parking, narrower aisles, while in theory the aisles are one-way, in practice they are typically wide enough to allow two cars to pass slowly when drivers go down the aisles the wrong way. Angle parking is common in car parking lots. Some cities have utilized angled parking on-street and this has been done mostly in residential, retail and mixed use areas where additional parking compared to parallel parking is desired and traffic volumes are lower. Most angled parking is design in a head-in configuration while a few cities have some back-in angled parking, angle parking is considered dangerous by cycling organisations, especially in the head-in configuration, but unwelcome in either form. When comparing to parallel parking, There is a significant risk to cyclists from vehicles reversing out, longer vehicles project further into the road, this can inconvenience/endanger other road users, The surplus road space which enables angle parking could also be used for bicycle lanes
11.
Retail
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Retail markets and shops have a very ancient history, dating back to antiquity. Retailing involves the process of selling goods or services to customers through multiple channels of distribution to earn a profit. Retailers satisfy demand is identified through a supply chain, Once the strategic retail plan is in place, retailers devise the retail mix which includes product, price, place, promotion, personnel and presentation. In the digital age, a number of retailers are seeking to reach broader markets by selling through multiple channels. Digital technologies are changing the way that consumers pay for goods. Retailing support services may include the provision of credit, delivery services. Shopping generally refers to the act of buying products, sometimes this is done to obtain final goods, including necessities such as food and clothing, sometimes it takes place as a recreational activity. Recreational shopping often involves window shopping and browsing, it not always result in a purchase. Retail shops occur in a range of types and in many different contexts - from strip shopping centres in residential streets through to large. Shopping streets may restrict traffic to pedestrians only, forms of non-shop retailing include online retailing and mail order. Retail comes from the Old French word tailler, which means to cut off, clip, pare and it was first recorded as a noun with the meaning of a sale in small quantities in 1433. Like in French, the retail in both Dutch and German also refers to the sale of small quantities of items. Also see History of merchants, History of the market place, open air, public markets were known in ancient Babylonia and Assyria. These markets typically occupied a place in the towns centre, surrounding the market, skilled artisans, such as metal-workers and leather workers, occupied premises in alley ways that led to the open market-place. These artisans may have sold wares directly from their premises, in ancient Greece markets operated within the agora, and in ancient Rome the forum. In antiquity, exchange involved direct selling, merchants or peddlers, the Phoenicians, noted for their seafaring skills, plied their ships across the Mediterranean, becoming a major trading power by 9th century BCE. The Phoenicians imported and exported wood, textiles, glass and produce such as wine, oil, dried fruit, the Phoenicians extensive trade networks necessitated considerable book-keeping and correspondence. In around 1500 BCE, the Phoenicians developed an alphabet which was much easier to learn that the complex scripts used in ancient Egypt
12.
Washington, D.C.
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Washington, D. C. formally the District of Columbia and commonly referred to as Washington, the District, or simply D. C. is the capital of the United States. The signing of the Residence Act on July 16,1790, Constitution provided for a federal district under the exclusive jurisdiction of the Congress and the District is therefore not a part of any state. The states of Maryland and Virginia each donated land to form the federal district, named in honor of President George Washington, the City of Washington was founded in 1791 to serve as the new national capital. In 1846, Congress returned the land ceded by Virginia, in 1871. Washington had an population of 681,170 as of July 2016. Commuters from the surrounding Maryland and Virginia suburbs raise the population to more than one million during the workweek. The Washington metropolitan area, of which the District is a part, has a population of over 6 million, the centers of all three branches of the federal government of the United States are in the District, including the Congress, President, and Supreme Court. Washington is home to national monuments and museums, which are primarily situated on or around the National Mall. The city hosts 176 foreign embassies as well as the headquarters of international organizations, trade unions, non-profit organizations, lobbying groups. A locally elected mayor and a 13‑member council have governed the District since 1973, However, the Congress maintains supreme authority over the city and may overturn local laws. D. C. residents elect a non-voting, at-large congressional delegate to the House of Representatives, the District receives three electoral votes in presidential elections as permitted by the Twenty-third Amendment to the United States Constitution, ratified in 1961. Various tribes of the Algonquian-speaking Piscataway people inhabited the lands around the Potomac River when Europeans first visited the area in the early 17th century, One group known as the Nacotchtank maintained settlements around the Anacostia River within the present-day District of Columbia. Conflicts with European colonists and neighboring tribes forced the relocation of the Piscataway people, some of whom established a new settlement in 1699 near Point of Rocks, Maryland. 43, published January 23,1788, James Madison argued that the new government would need authority over a national capital to provide for its own maintenance. Five years earlier, a band of unpaid soldiers besieged Congress while its members were meeting in Philadelphia, known as the Pennsylvania Mutiny of 1783, the event emphasized the need for the national government not to rely on any state for its own security. However, the Constitution does not specify a location for the capital, on July 9,1790, Congress passed the Residence Act, which approved the creation of a national capital on the Potomac River. The exact location was to be selected by President George Washington, formed from land donated by the states of Maryland and Virginia, the initial shape of the federal district was a square measuring 10 miles on each side, totaling 100 square miles. Two pre-existing settlements were included in the territory, the port of Georgetown, Maryland, founded in 1751, many of the stones are still standing
