Answer: Reconstruction
Explanation:
In the "corrupt bargain" of 1877, Democrats allowed Republican Rutherford B. Hayes to become President and in exchange he ended Reconstruction/Federal occupation in the south what allowing Jim Crow to reign supreme there
The presidential election of 1876 was a controversial one in that there were 4 states which had unresolved votes. Democratic candidate, Samuel J. Tilden had won the popular vote and was poised to win the electoral college as well but a deal was struck between Rutherford and the Democrats that he would withdraw Federal troops from the south which was the last thing enforcing Reconstruction in the South.
In return the Democrats voted to accept a decision that would give Rutherford the contented electoral votes and upon being made president, he withdraw the Federal troops which allowed the Southern States to enforce Jim Crow laws.
