What was the reason for rapid growth of labor unions in the late 1800s

the federal constitution of the united mexican states of 1824 was enacted on october 4 of 1824, after the overthrow of the mexican empire of agustin de iturbide. in the new constitution, the republic took the name of of united mexican states. it was replaced by the federal constitution of the united mexican states in 1857.

the american civil war was not caused   by slavery but by economic factors.