Until 1964, Oklahoma was considered a "swing state" in American politics, shifting back and forth in its support for the two major parties. This was in part due to Oklahoma's situation both as a part of the Great Plains states, which tended to be reliably Republican, and the South, which was heavily Democratic at that time.
Oklahoma was a "swing state" in American politics until 1964, meaning it fluctuated between supporting the two major parties. This was influenced by Oklahoma's location within both the Great Plains states, which were generally Republican, and the South, which was heavily Democratic at that time.