Why did requiring the payment of a poll tax keep many African Americans from voting?

Explanation:

In the United States, voting poll taxes (whose payment was a precondition to voting in an election) have been used to disenfranchise impoverished and minority voters (especially under Reconstruction).

the virginia plan called for three branches of government and two houses of congress. representation in each house would be determined by population. the new jersey plan called for three branches of government and a single house of congress. each state would have an equal vote.