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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.

Lu'an is a prefecture-level city in Anhui Province. Located in the west of Anhui Province, known as "Gaocheng" for short, located between the Yangtze River and the Huaihe River, the northern foot of the Dabie Mountains, the west wing of the Yangtze River Delta economic zone, the geographical meaning of "West Anhui" specifically refers to Liu'an. Liu'an is located in Jianghuai, with Wu Yue in the east, Jingchu in the west and the Central Plains in the north; the terrain is high in the southwest and flat in the northeast, showing a trapezoidal distribution; it belongs to the transition zone from the north subtropical zone to the warm temperate zone, with significant monsoons and four distinct seasons. In 2017, the city has a total area of 15451 square kilometers and a registered population of 5.882 million. It has jurisdiction over 3 districts and 4 counties. The name of Lu'an began with Emperor Wu of the Han Dynasty, taking the first words of six counties in Hengshan, Anfeng and Anfeng, and other Hengshan countries as Lu'an, with the meaning of "peace in six places, never rebellion". Because Shun Feng Gao Tao in six, so later generations called Liu'an
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