• Tulsa
  • Yong De County

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.

Yongde County belongs to Lincang City, Yunnan Province, which controls the Nanting River in the east and strangles the Nujiang River in the west. It is surrounded by Gengma County, Zhenkang County, Longling County, Shidian County, Changning County, Fengqing County and Yun County. Yongde County was analyzed in 1963. The county has a Dedang town, so it is named Yongde. The area is 71.5km wide from east to west and 75.8km from north to south, with a total area of 3296 square kilometers, with mountainous areas accounting for 95 per cent. Yongde County has jurisdiction over 3 towns and 7 townships (including 2 ethnic townships), living in 22 ethnic groups, including Han, Yi, WA, Brown, Dai, Lisu and Lahu, with a total population of 369700 (2010). The climate of Yongde County generally belongs to the valley monsoon climate with the confluence of the south subtropics and the north tropics. The terrain is high in the southeast and west, tilting to the north, shaped like mulberry leaves. Although the surface of the county is inclined and relatively broken, it is suitable for tillage.
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