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Omaha (/ˈoʊməhɑː/ OH-mə-hah) is the largest city in the U.S. state of Nebraska and the county seat of Douglas County. Omaha is in the Midwestern United States on the Missouri River, about 10 mi (15 km) north of the mouth of the Platte River. The nation's 39th-largest city, Omaha's 2020 census population was 486,051.

Omaha is the anchor of the eight-county, bi-state Omaha-Council Bluffs metropolitan area. The Omaha Metropolitan Area is the 58th-largest in the United States, with a population of 967,604. The Omaha-Council Bluffs-Fremont, NE-IA Combined Statistical Area (CSA) totaled 1,004,771, according to 2020 estimates. Approximately 1.5 million people reside within the Greater Omaha area, within a 50 mi (80 km) radius of Downtown Omaha. It is ranked as a global city by the Globalization and World Cities Research Network, which in 2020 gave it "sufficiency" status.

Omaha's pioneer period began in 1854, when the city was founded by speculators from neighboring Council Bluffs, Iowa. The city was founded along the Missouri River, and a crossing called Lone Tree Ferry earned the city its nickname, the "Gateway to the West". Omaha introduced this new West to the world in 1898, when it played host to the World's Fair, dubbed the Trans-Mississippi Exposition. During the 19th century, Omaha's central location in the United States spurred the city to become an important national transportation hub. Throughout the rest of the 19th century, the transportation and jobbing sectors were important in the city, along with its railroads and breweries. In the 20th century, the Omaha Stockyards, once the world's largest, and its meatpacking plants gained international prominence.

Longchuan, known as "Yuanyuan" in Dai language, means the place where the sun shines. Dehong Prefecture, Yunnan Province, is located in the southwest border of China, connected with Myanmar by mountains and rivers and buildings. The border is 50.899 kilometers long, with a land area of 1931 square kilometers and a total population of 181580 (2010). The county seat Zhangfeng is 779km away from Kunming, the provincial capital. It is the end of China's southwest border. Longchuan County has jurisdiction over eight townships and four towns and one state-owned farm, with a total area of 1913 square kilometers, with an area of 350000 mu of arable land, with a per capita cultivated land of nearly 3 mu. The county has a total population of 180000, including 120000 agricultural people. The main ethnic minorities in the territory are Jingpo, Dai, Achang, Lisu, Deang and Hui, which have the largest population distribution of Jingpo and Achang in China. Longchuan is a typical frontier multi-ethnic farmer.
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