• Tulsa
  • Yitong Manchu Autonomous 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.

Yitong Manchu Autonomous County, which belongs to Siping City, Jilin Province, is the only Manchu Autonomous County in Jilin Province. "Yitong" is a Manchu transliteration, derived from the name of Yitong River, which means "grand, surging river". Yitong Manchu Autonomous County is located in the middle of Jilin Province, the upper reaches of Yitong River, the south of the provincial capital Changchun, Shuangyang District of Changchun City in the east, Panshi City in the southeast, Dongfeng and Dongliao counties in the south, Lishu County in the southwest, Gongzhuling City in the southwest and the suburbs of Changchun in the north. The territory is 76 kilometers from east to west, 66 kilometers from north to south, and covers an area of 2523 square kilometers. It was first promoted to Yitong Prefecture in the eighth year of Guang Xu (1882) and Yitong Zhili Prefecture in the first year of Xuantong (1909). In 1913, the state was withdrawn and the county was established. On August 30, 1988, Yitong County was abolished and established.
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