• Tulsa
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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.

Siyang is located in Subei Plain, one of the "Ten New Tianfu" in China, belongs to the Yangtze River Delta region, is the Huaihai Economic Circle, the Yangtze River Delta Economic Circle and the cross radiation area along the canal town axis. Siyang faces the hometown of Zhou Enlai Huai'an to the east, Suqian the hometown of King Xiang to the west, Shuyang, the hometown of flowers and plants to the north, and Hongze Lake to the south, facing Sihong, Hongze and Xuyi across the lake. The Siyang section of the Grand Canal of China (the Beijing-Hangzhou Grand Canal and the ancient Yellow River heritage site) is on the World Heritage list. It has the reputation of "plain, forest and sea, Xanadu". Siyang has a history of more than 5000 years of civilization and more than 2000 years of history of establishing a county, where the north and south cultures are integrated. Siyang was once the capital of Sishui in the Western Han Dynasty more than two thousand years ago. It has been established at the county level in 2233 years, and it was crowned twice in the Western Han Dynasty, which was called "Surabaya" in history, which lasted for 134 years. Siyang is China.
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