• 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.

Heilongjiang Province, referred to as "black", the provincial capital Harbin, is the northernmost and easternmost provincial administrative region in China, with a total area of 473000 square kilometers. The geomorphological feature of Heilongjiang Province is "five mountains, one water and one grass". The terrain is generally high in the northwest, north and southeast, and low in the northeast and southwest, which is composed of mountains, platforms, plains and water surfaces; the land spans the four major river systems of Heilongjiang, Wusuli River, Songhua River and Suifenhe, belonging to cold temperate and temperate continental monsoon climate. Heilongjiang Province, located in the hinterland of Northeast Asia, is an important passage from Asia and the Pacific to Russia and the European continent, and an important window for China to open along the border. As of August 2019, Heilongjiang Province had jurisdiction over 12 prefecture-level cities and 1 district; there were 54 municipal districts, 21 county-level cities, 45 counties,
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