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Tulsa (/ˈtʌlsə/) is the second-largest city in the state of Oklahoma and 47th-most populous city in the United States. The population was 413,066 as of the 2020 census. It is the principal municipality of the Tulsa Metropolitan Area, a region with 1,023,988 residents. The city serves as the county seat of Tulsa County, the most densely populated county in Oklahoma, with urban development extending into Osage, Rogers, and Wagoner counties.

Tulsa was settled between 1828 and 1836 by the Lochapoka Band of Creek Native American tribe and most of Tulsa is still part of the territory of the Muscogee (Creek) Nation.[a]

Historically, a robust energy sector fueled Tulsa's economy; however, today the city has diversified and leading sectors include finance, aviation, telecommunications and technology. Two institutions of higher education within the city have sports teams at the NCAA Division I level: Oral Roberts University and the University of Tulsa. As well, the University of Oklahoma has a secondary campus at the Tulsa Schusterman Center, and Oklahoma State University has a secondary campus located in downtown Tulsa. For most of the 20th century, the city held the nickname "Oil Capital of the World" and played a major role as one of the most important hubs for the American oil industry.

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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