• Tulsa
  • Xincai 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.

Xincai County, known as Caizhou in ancient times, is directly administered by Henan Province, located in the southeast of Henan Province, with a total area of 1453 square kilometers, cultivated land of 1.48 million mu, 20 townships, 3 streets and 361 village committees. Xincai County is a national advanced county in grain production, advanced in scientific and technological progress, direct administration county in Henan Province, forestry ecological county in Henan Province, Shuangyong model county in Henan Province, provincial garden city in Henan Province, and sanitary city in Henan Province. In the early years of the Xia Dynasty, the descendant of Emperor Yan and the inventor of Chinese well sinking, Bo Yi, who assisted Dayu in flood control, was named Lu Hou and established Lu here. During the Spring and Autumn period (529 BC), Cai Pinghou moved the capital to Gulu, which is known as Xin Cai Guo, hence the name Xin Cai. In 2017, Xincai County has a total population of 1.1412 million. August 1, 2018, Henan Provincial Government
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