• Tulsa
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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.

Jianchang County, which belongs to Huludao City, Liaoning Province, is located in the northwest of Huludao City. It is bordered by Lianshan District and Xingcheng City in the east, Suizhong County in the south, Lingyuan City in the northwest, Azure Dragon Manchu Autonomous County and Haigang District in Qinhuangdao City, Hebei Province in the southwest, and Kazuo and Chaoyang counties in the north. Jianchang County has a total land area of 3181 square kilometers. Cultivated land is 890000 mu. The population of Jianchang County is 650000 (2011). There are Han, Manchu, Mongolian, Hui, Korean and other ethnic groups. Jianchang County is located in the hilly and mountainous areas of western Liaoning, where the Yanshan Mountains extend. The terrain is high in the northwest and low in the southeast. The Songling Mountains run northeast and southwest, running through the county. Daqingshan, the highest peak, is 1223 meters above sea level and is famous for its roofs in western Liaoning. There are more than 40 rivers that originate and flow through the county, and the main rivers are Daling River, Liugu River, Qinglong River and Heishui River. Within the territory, there are large,
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