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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.

Huainan, a prefecture-level city under the jurisdiction of Anhui Province, referred to as "Huai" and the ancient name "Zhoulai", is located in the central and northern part of Anhui Province, in the hinterland of the Yangtze River Delta and on the bank of the Huaihe River. it is known as "Zhongzhou throat, Jiangnan barrier" and "colorful Huainan". It is an important node of the urban agglomeration along the Huaihe River and the core city of Hefei metropolitan area. Huainan has a total area of 5571 square kilometers and has jurisdiction over 5 districts and 2 counties. By the end of 2016, the total population was 3.456 million. Huainan is the energy capital of China, the industrial granary of East China, the important industrial city of Anhui Province and one of the 13 larger cities of the State Council. It has obtained China's excellent tourist cities, 100 livable cities, national greening model cities, national garden cities, the first batch of national pilot smart cities, the best investment cities in China, the happiest cities in China, and Chinese idioms.
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