Once called Indian Territory because it was home to the five "civilized" tribes, Oklahoma was one of the last states to join the United States (1907). In the summer of 1905, the principal chiefs of four of the Five Civilized Tribes united in issuing a call for a constitutional convention to meet at Muskogee, on August 21, for the purpose of forming a constitution of a state to be composed of the Indian Territory. It finally became the 46th state on November 16, 1907. Celebrate your state's history by displaying state symbols, animals, and state flags. Find your supplies at Flagandbanner.com today.