When did the region formerly known as Indian Territory begin to use the name Oklahoma? during early settlements during the Indian Removal with the separation from the Union as arrangements were being made during Reconstruction

The informal nickname of Oklahoma is The Sooner State because in 1889, the Indian territory was opened to settlers, and the lands were awarded to those who first arrived. There were those who broke the rules and crossed the border into the territory earlier than allowed. These people were called sooners.

Negotiations to convert the territory into a state began in the early twentieth century, when all tribal jurisdictions in Indian Territory were abolished. Initially, attempts to create an Indian state with the name of Oklahoma, and a subsequent attempt to create an Indian state called Sequoyah, did not prosper.

However, at the Sequoyah State Convention of 1905, the foundations were laid for the Oklahoma State Convention, which took place two years later. On November 16, 1907, Oklahoma was established as the 46th state of the Union.