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Washington, D.C., formally the District of Columbia and also known as D.C. or Washington, is the capital city of the United States of America. Founded after the American Revolution, Washington was named for George Washington, the first president of the United States and a Founding Father. As the seat of the United States federal government and several international organizations, Washington is an important world political capital. Located on the Potomac River bordering Maryland and Virginia, the city is one of the most visited cities in the United States, with more than 20 million visitors annually.The signing of the Residence Act on July 16, 1790, approved the creation of a capital district located along the Potomac River near the country's East Coast. The U.S. Constitution provided for a federal district under the exclusive jurisdiction of the U.S. Congress, and the district is therefore not a part of any U.S. state. The states of Maryland and Virginia each donated land to form the federal district, which included the pre-existing settlements of Georgetown and Alexandria. The City of Washington was founded in 1791 to serve as the new national capital. In 1846, Congress returned the land originally ceded by Virginia, including the city of Alexandria; in 1871, it created a single municipal government for the remaining portion of the district.
Washington had an estimated population of 705,749 as of July 2019, making it the 20th most populous city in the United States. Commuters from the surrounding Maryland and Virginia suburbs raise the city's daytime population to more than one million during the workweek.
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Perth ( (listen); Nyungar: Boorloo) is the capital and largest city of the Australian state of Western Australia (WA). It is Australia's fourth-most populous city, with a population of 2.14 million living in Greater Perth. Perth is part of the South West Land Division of Western Australia, with most of the metropolitan area on the Swan Coastal Plain between the Indian Ocean and the Darling Scarp. The city has expanded outward from the original settlements on the Swan River, upon which the city's central business district and port of Fremantle are situated.
Captain James Stirling founded Perth in 1829 as the administrative centre of the Swan River Colony. It was named after the town of Perth, Scotland, due to the influence of Stirling's patron Sir George Murray, who had connections with the area. It gained city status in 1856, although the Perth City Council currently governs only a small area around the central business district. The city's population increased substantially as a result of the Western Australian gold rushes in the late 19th century. It has grown steadily since World War II due to a high net migration rate. Post-war immigrants were predominantly from Britain and Southern Europe, while more recent arrivals have led to a large population of Asian descent. Several mining booms in other parts of Western Australia in the late 20th and early 21st centuries saw Perth become the regional headquarters for large mining operations.