Answer:
It is the principle of popular, direct election of congressional members. The US Constitution said in the beginning that two Senators will be elected in each state by the state legislature. But since 1913, when the 17th Amendment came into force, two senators are elected by the vote of the people in each state for six years.
Explanation:
Driven in part by economic concerns, and in part by frustration with the straitened social conditions of the South, in the 1870s African Americans began moving North and West in great numbers. In the 1890s, the number of African Americans moving to the Northeast and the Midwest was double that of the previous decade.
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