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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.

Guanxian, a county under the jurisdiction of Liaocheng City, Shandong Province, is located at the junction of Hebei, Shandong and Henan provinces, with Dongchangfu District to the east, Linqing City to the north and Shenxian to the south. The whole territory is located in the yellow flood plain in northwest Shandong, which is part of the North China Plain with four distinct seasons; the total area is 1152 square kilometers. Jurisdiction over 3 streets, 11 towns, 4 townships; 2016 total population of 866300. Guanxian has a long history. Ran Zi, a disciple of Confucius, traveled here for a long time, and Xiaocheng, an ancient city in the Song and Liao dynasties, survived. In Guanxian, Ji-Yi Railway connects Jingjiu to the east and Jing-Guang to the west, Qinglan Expressway and 329 Provincial Highway run through the whole territory. Jingjiu Highway and National Highway 106 run through the north and south; Chaquan, Liulin Huagu and Langzhuang flour sculptures all originated in Guanxian. In 2016, the GDP of Guanxian County reached 28.719 billion yuan, an increase over the previous year at comparable prices.
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