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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.

Pengan County is located in the middle reaches of Jialing River, a famous historical and cultural city at the provincial level, the top ten eco-tourism demonstration cities in China, the top 50 most beautiful small cities in China, and the Qingxi River in Jialing River. it is a very beautiful landscape park city. Nanchong has established an integrated city in the same city. Pengan has a long history, outstanding people, unique location, convenient transportation from Chengdu 230 km, Chongqing 200 km, from the main city of Nanchong and Gaoping Airport only 30 minutes by car, closely integrated into the Chengdu-Chongqing "two-hour economic circle" and Nanchong "half-hour economic circle". Located in the northeast of Sichuan Province, Xiazhong County, Nanchong City, in 507 AD (the sixth year of Tianjian in the Southern Dynasty), Emperor Liang Wu named the county in memory of Sima Xiangru, which was incorporated into Pengzhou in 1371. Pengzhou changed its name to "Pengan" in 1913, with a total population of 730000.
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