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Baltimore (/ˈbɔːltɪmɔːr/ BAWL-tim-or, locally: /bɔːldəˈmɔːr/ bawl-da-MOR or /ˈbɔːlmər/ BAWL-mər) is the most populous city in the U.S. state of Maryland, fourth most populous city in the Mid-Atlantic, and the 30th most populous city in the United States with a population of 585,708 in 2020. Baltimore was designated an independent city by the Constitution of Maryland[a] in 1851, and today is the most populous independent city in the United States. As of 2021, the population of the Baltimore metropolitan area was estimated to be 2,838,327, making it the 20th largest metropolitan area in the country. Baltimore is located about 40 miles (64 km) north northeast of Washington, D.C., making it a principal city in the Washington–Baltimore combined statistical area (CSA), the third-largest CSA in the nation, with a 2021 estimated population of 9,946,526.

Prior to European colonization, the Baltimore region was used as hunting grounds by the Susquehannock Native Americans, who were primarily settled further northwest than where the city was later built. Colonists from the Province of Maryland established the Port of Baltimore in 1706 to support the tobacco trade with Europe, and established the Town of Baltimore in 1729. The first printing press and newspapers were introduced to Baltimore by Nicholas Hasselbach and William Goddard respectively, in the mid-18th century.

The Battle of Baltimore was a pivotal engagement during the War of 1812, culminating in the failed British bombardment of Fort McHenry, during which Francis Scott Key wrote a poem that would become "The Star-Spangled Banner", which was eventually designated as the American national anthem in 1931. During the Pratt Street Riot of 1861, the city was the site of some of the earliest violence associated with the American Civil War.

Tongde County is located in the southeast of Qinghai Province, at the junction of Hainan, Huangnan and Guoluo Tibetan Autonomous Prefecture, and belongs to the people's Government of Hainan Prefecture. The Xijiu Highway, the provincial highway, runs through the whole territory from north to south, and the Yellow River surrounds the county in a half-ring from east to west. The county seat is located 3060 meters above sea level, 256km away from the state capital Chabqa town and 282km away from the provincial capital Xining, with a resident population of about 9000. The climate is typical plateau continental climate, the highest elevation in the county is 4671 meters, the lowest elevation is 2648 meters, the average elevation is 3660 meters, the average annual temperature is 0.4 ℃-0.6 ℃, the average annual precipitation is 440mm, and there is no absolute frost-free period. The county has a total area of 4758 square kilometers and has jurisdiction over 73 administrative villages in 2 towns and 3 townships. In 2009, the total population was 61000.
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