Why must an object turning in a circle be accelerating?

Because the direction of the velocity vector is changing.

Explanation:

Because velocity is a vector quantity (that is, it has both a magnitude, speed, and direction), when a body travels on a circular path, its direction constantly changes, and thus its velocity changes, producing an acceleration.

the first action that caused many creek indians to turn against william mcintosh was when mcintosh a) supported the united states during the creek war of 1813–1814. b) attempted to stop the sale of creek land to the u.s. government. c) seized control of over 1,000 acres of land belonging to the creeks.