8. Rutherford B. Hayes was declared the winner of the 1876 presidential election after he O won the popular vote.
O won the electoral vote by a landslide.
O made a compromise with the Democrats.
won an election in the House of Representatives.

3rd option

Explanation:

"An informal deal was struck to resolve the dispute: the Compromise of 1877, which awarded all 20 electoral votes to Hayes; in return for the Democrats' acquiescence to Hayes' election, the Republicans agreed to withdraw federal troops from the South, ending Reconstruction."

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