Final answer:
The end of Reconstruction was marked by the contested Presidential election of 1876, where Rutherford B. Hayes became president in exchange for the withdrawal of federal troops from the South.
Step-by-step explanation:
The end of Reconstruction was marked by the contested Presidential election of 1876. Rutherford B. Hayes, the Republican candidate, became president in exchange for the withdrawal of federal troops from the South. By that time, the majority of federal troops had already left, and white Democrats had regained political control in the South, bringing an end to the era of Reconstruction.