• Tulsa
  • Yan’an

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.

Yan'an City, referred to as "Yan", the prefecture-level city of Shaanxi Province, is the first mausoleum in the world-the mausoleum of the first ancestor of the Chinese nation, the mausoleum of the Yellow Emperor: the site of the Yellow Emperor Mausoleum, is a sacred place for the nation, a sacred place for the Chinese revolution, and the first batch of famous national historical and cultural cities announced by the State Council. Yan'an is located in the north of Shaanxi Province, in the middle reaches of the Yellow River, in the south-central part of the Loess Plateau, and 371 kilometers north of the provincial capital Xi'an. It is connected to Yulin in the north, Xianyang, Tongchuan and Weinan in Guanzhong to the south, Linfen and Luliang in Shanxi to the east, and Qingyang in Gansu to the west. With a total area of 37037 square kilometers, it is known as "Sanqin key, five-way flap throat". Yan'an, known as Fushi and Yanzhou, is an important birthplace of the Chinese nation and the ancestor of humanities.
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