Which historic phenomenon had the most significant impact on early socialist thinkers?

The industrial revolution

Explanation:

during the industrial revolution, the demands for human labors was massively increased. Since there was no government regulation to protect workers at that time, a lot of them were treated unfairly by business owners (not enough salary and horrible working condition).

This gave a significant impact on early socialists thinkers to fight for those abused workers.

there were 6 major base camps.   the base camps were located in alva, fort reno, fort sill, the madill provisional internment camp headquarters, mcalester and camp gruber.

the structure was most likely used for;

c. playing a ball game with stone hoops