One reason African Americans did not achieve full freedom after the Civil War was they really lost their right to vote. Though the 15th Amendment states that the right to vote cannot be denied on account of race, African Americans were denied this right. One way African Americans were deprived of their right to vote was through the use of poll taxes. A poll tax was a payment a person would have to make in order to vote. African Americans were the poorest members of society so many could not afford this tax. Another way African Americans were deprived of their right to vote was through literacy tests. A person would have to show that he could read and write in order to vote. African Americans were the least educated members of society so many could not pass this test. Many times these tests were rigged so African Americans would fail them. To allow poor, illiterate whites to vote, grandfather clauses were passed which allowed anyone whose father or grandfather was eligible to vote before 1867 would not have to pay the tax or take the test. Since no African Americans were allowed to vote prior to the passage of the 15th Amendment in 1867, the grandfather clause would not apply to them, but would allow poor, illiterate whites to vote.
The South began to become completely segregated. Jim Crow laws were passed to enforce this segregation. The Supreme Court in the case of Plessy v. Ferguson said that segregation was constitutional if the separate facilities for blacks and whites were equal. The fact that most facilities were not equal was ignored everywhere.
Finally, organizations such as the Ku Klux Klan were established which used violence or the threat of violence to keep African Americans from voting, to enforce strict segregation, and to keep African Americans from even attempting to gain their civil rights.
because the south needed slaves still but couldn't enslave them so created jim crow laws witch wasn't very diffrent from slavery