What did the labor strikes have in common?

The labor strikes have in common is discussed below in details.

Explanation:

Strike action, also designated labor strike, labor strike, or absolute strike, is a work stoppage, created by the majority refusal of operators to work. A strike normally takes the position in acknowledgment of employee complaints. Strikes became prevalent throughout the Industrial Revolution when the majority of labor became essential in industries and mines. and if talks fails violence occurred.

answer; /// i do believe that the correct answer is (a); a farming tribe that settled primarily along the mississippi and arkansas rivers;