• Tulsa
  • Zhidan 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.

Zhidan County, which belongs to Yan'an City, Shaanxi Province, is located in the hilly and gully region of the Loess Plateau in the north of Shaanxi Province, connected with Ansai in the east, Wuqi County and Jingbian County in the northwest, Ganquan County and Fuxian County in the southeast, and Heshui County and Huachi County in Gansu Province in the southwest. Between longitude 108o 11mm 56 "- 109o 3m 48" east and latitude 36o 21m 23 "- 37o 11m 47" north, with a total area of 3781 square km. Zhidan County, formerly known as Baoan County, was renamed Zhidan County in June of 1936 in memory of General Liu Zhidan, a "mass leader and national hero". In July of the 25th year of the people's Republic of China (1936), the Central people's Government of the Chinese Soviet Union held the capital Zhidan. The CPC Central Committee and Chairman Mao fought and lived here for more than six months, known as the Central Committee of the Communist Party of China.
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