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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.

Liangzhou District, known as Gudu and Xiutu in ancient times, is located in the longitude of 101 °59 and the latitude of 37 °23 and 38 °12, respectively. It is located in the northwest of Gansu Province, the eastern end of Hexi Corridor, the northern foot of Qilian Mountain and the middle of Wuwei City, with an average elevation of 1632 meters. Liangzhou District belongs to Wuwei City, Gansu Province, bordering Inner Mongolia Autonomous region to the east, Sunan Yugu Autonomous County to the west, Tianzhu Tibetan Autonomous County and Gulang County to the south, and Yongchang County and Minqin County to the north. As of 2014, Liangzhou District has a total area of 5081 square kilometers, living in Han, Hui, Tibetan, Manchu and other 25 ethnic groups, with a total population of 1.0225 million (2012). In 2018, the district has jurisdiction over 37 towns, 2 headquarters and 8 urban subdistrict offices. Liangzhou District has a temperate continental arid climate, 20
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