What year did Oklahoma become a state?

Oklahoma became a state on November 16, 1907. This marked the culmination of a process that started with the land runs and the establishment of the Oklahoma Territory, which allowed for settlement in the region. The passage of statehood was significant, as it represented the integration of diverse populations and cultures following the incorporation of various territories and lands previously occupied by Native American tribes.

The other years provided do not correspond with Oklahoma's admission as a state. For instance, 1905 was a year when there were discussions and attempts to establish statehood, but it was not formalized until 1907. The year 1910 is notable in other contexts, such as census data and the further development of the state, while 1920 falls well after statehood, reflecting an era of growth and establishment in the newly formed state. Thus, 1907 is the correct answer, as it marks the official recognition of Oklahoma as the 46th state in the United States.