Question

When was the term "Oklahoma" first used in an official document? Who suggested the name?

Answer 1

of the United States and had been suggested by Allen Wright, member of the Choctaw delegation.

Step-by-step explanation:

Answer 2

A clause in this treaty (July 1866) referred to all the area of the Five Tribes as the "territory of Oklahoma." This was the first mention of the name Oklahoma in an official document of the United States and had been suggested by Allen Wright, member of the Choctaw delegation.