How did the literacy test, poll taxes, and grandfather clause keep black people from voting

many black people during that time were uneducated thus being the reason a literacy test was made to be taken. Many black people didn't have jobs or money so high poll taxes made it difficult for them to vote. And the grandfather clause allowed old rules to be imposed so it would be even harder for them to vote.

Explanation:

on december 1, 1774, the continental association was created to boycott all contact with british goods. by reversing the economic sanctions placed on the colonists, the delegates hoped britain would repeal its intolerable acts.

can you explain it better