How did the election of 1876 end Reconstruction efforts to ensure African American equality in the South?

a.
Hayes won the election with a promise to his voters that he would ensure the repeal of the 14th and 15th Amendments.
b.
Once the federal troops left the South, African Americans lost many of the rights they recently gained during Reconstruction.
c.
Since a Democrat won the election, the old leaders of the South were able to come back to power.
d.
Hayes appointed many African Americans to his cabinet, which helped ensure equality for all citizens in the South.