• Tulsa
  • Lankao County

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.

Lankao, a county under the jurisdiction of Kaifeng City, Henan Province, and Zhiguan County, Henan Province, is located at the last bend of the Jiuqu Yellow River, with a total area of 1116 square kilometers and a total population of 859100. It is an important part of "half-hour traffic circle" in "one pole, two circles and three layers" in Henan Province. Lankao County was a household in the Spring and Autumn period, and Jiyang County was the beginning of Lankao County in the Qin Dynasty. In 5 BC, Emperor Liu Xiu, Emperor of the Han Dynasty, was born in the Jiyang Palace in the north of the county. In 9 years, it was changed from Dongfen County to Dongming County. In 1218, Dongming County was abandoned as Tongan Castle, and the new county seat was moved to the old land of Yuanggu County in the north of the Yellow River. In 1232, the south of the Yellow River was divided into two counties: Lanyang County and Yifeng County. In March 1783, the county seat of Kaocheng County moved to Lankao County for the first time. In 1825, Yifeng County was merged into Lanyang County, known as "Lanyi County".
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