How did tribal locations within Oklahoma influence their decisions to support the Union or the Confederacy?

They thought it was "The Better Choice"  because of its opposition to a central Federal System, which had lacked some respect for the Indian nations. 6 Tribes thought different from this reason.

Explanation:

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers

the correct answer is (d.) gerrymandering. i hope this . : )