• Tulsa
  • Diebu Country

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.

Diebu County, under the jurisdiction of Gannan Tibetan Autonomous Prefecture, Gansu Province, is located in the alpine canyon between Xiyanmin and Dieshan mountain systems in the Qinling Mountains, at the junction of Ganchuan on the eastern edge of the Qinghai-Tibet Plateau, Zhuoni in the north, Zhouqu in the east, Hadapu in Dangchang in the northeast, and Ruoergai County and Jiuzhaigou County in Sichuan in the southwest. It has a total area of 5108.3 square kilometers and has jurisdiction over 5 towns and 6 townships. In 2017, there were 54000 permanent residents, including Tibetan, Hui, Mongolian and other ethnic minorities. Diebu County was called "Diezhou" in ancient times, which means "thumb" in Tibetan and was called the place where the mountain gods "pressed" it. There are revolutionary sites such as the "Russian Boundary Conference" of the Red Army during the long March, the former residence of Chairman Mao in Zirina, and the Natural Insurance Battle of Lazikou. In addition, there are also Majiayao cultural sites and Tibetan Buddhist monasteries. September 25, 2018
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