• 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.

Sanyuan County, Xianyang City, Shaanxi Province, is known as "Jiayi" in history and "Chiyang" in ancient times, which is located in the middle of Guanzhong Plain in Shaanxi Province. It is named after Xiyuan (also known as Qiliyuan), Central Plains (also known as Xinxingyuan) and Dongyuan (also known as Lingqian Yuan). Sanyuan is the ancient capital city, since the Northern Wei Taiping Zhenjun seven years (AD 446) home county, has a history of more than 1570 years, known as "food and clothing capital, hundreds of millions of mouth" reputation. County area of 576.9 square kilometers, commonly used arable land area of 491265 mu, jurisdiction 1 street office 9 towns 4 centers 172 administrative villages, the county's registered population of 408165 (2018). Sanyuan is located in the arc center of Xi'an, Xianyang, Weinan, Tongchuan and other surrounding large and medium-sized cities, connected with Lintong, Fuping and Yanliang in the east, Gaoling in the south and Jingyang and Chun in the west.
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