Tulsa is the second-largest city in the state of Oklahoma and 45th-largest city in the United States. With a population of 391,906 as of the 2010 census, it is the principal municipality of the Tulsa Metropolitan Area, a region with 946,962 (2011) residents in the MSA and 998,438 (2011) in the CSA. Tulsa's CSA is projected to reach one million in late 2012. The city serves as the county seat of Tulsa County, the most densely populated county in Oklahoma, and extends into Osage, Rogers, and Wagoner counties. Tulsa was first settled between 1828 and 1836 by the Lochapoka Band of Creek Native American tribe. In 1921, it was the site of the infamous Tulsa Race Riot, one of the largest and most destructive acts of racial violence in the history of the United States. 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.
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