What event is recognized as Oklahoma's statehood?

Oklahoma's statehood is recognized by the admission of Oklahoma as a state in 1907. This event marked a significant transition from territorial status to statehood, which entailed formal recognition by the federal government and the establishment of a new state constitution. This move brought Oklahoma into the Union as the 46th state and represented the culmination of various historical events, including land runs, treaties, and the settlement of various communities within the region.

The admission process involved extensive political and legislative actions, highlighting the importance of governance and civic systems that would shape the state's future. The year 1907 is thus significant not just for Oklahoma, but also in the context of American expansion and its historical landscape.