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  • Xi’an,Si’an,Chang’an

New York, often called New York City[a] or NYC, is the most populous city in the United States. With a 2020 population of 8,804,190 distributed over 300.46 square miles (778.2 km2), New York City is also the most densely populated major city in the United States, and is more than twice as populous as second-place Los Angeles. New York City lies at the southern tip of New York State, and constitutes the geographical and demographic center of both the Northeast megalopolis and the New York metropolitan area, the largest metropolitan area in the world by urban landmass. With over 20.1 million people in its metropolitan statistical area and 23.5 million in its combined statistical area as of 2020, New York is one of the world's most populous megacities, and over 58 million people live within 250 mi (400 km) of the city. New York City is a global cultural, financial, entertainment, and media center with a significant influence on commerce, health care and life sciences, research, technology, education, politics, tourism, dining, art, fashion, and sports. Home to the headquarters of the United Nations, New York is an important center for international diplomacy, an established safe haven for global investors, and is sometimes described as the capital of the world.

Xi'an, known as Chang'an and Jiajing in ancient times, is the capital of Shaanxi Province, the vice-provincial city, the core city of Guanzhong Plain urban agglomeration, the starting point of the Silk Road, the core area of "Belt and Road Initiative" and an important central city in western China. It is an important national scientific research, education and industrial base. The "historic city of the world" identified by the United Nations Educational, Scientific and Cultural Organization in 1981. Located in the middle of Guanzhong Plain, it is bordered by the Weihe River in the north, Qinling Mountains in the south and Chang'an in Bashui. Under its jurisdiction, 11 districts and 2 counties are in charge of Xixian New District, with a total area of 10752 square kilometers, with a resident population of 10.0037 million at the end of 2018 and a urbanization rate of 74.01%. The annual gross domestic product of the region is 834.986 billion yuan. Xi'an is one of the important birthplaces of Chinese civilization and the Chinese nation. In history, more than ten dynasties have established their capitals here.
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