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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.

Zhenglan Banner is a flag belonging to Xilingol League of Inner Mongolia Autonomous region. it is located in the south of Inner Mongolia Autonomous region and the southern end of Xilingol League in Paradise grassland. It is only 180 kilometers away from the capital Beijing. It is the nearest typical grassland area to Beijing. Longitude 116.02 °east, latitude 42.25 °north. Zhenglan Banner has a total area of 10182 square kilometers, a total population of 83000 and a peak population of 105000. It is a multi-ethnic area dominated by Mongolians. It is Hunshandake sandy land in the north, showing the natural scenery of sandy grassland, and low mountains and hills in the south, showing the beauty of meadow steppe. Zhenglan Banner is rich in water resources, including 21 rivers and 147 lakes. The banner is rich in wild animal and plant resources. There are 708 species of plants and rare fields in the banner.
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