Final answer:
The Compromise of 1877 ended the Reconstruction Era, resolved the 1876 election, and removed federal troops from state politics.
Step-by-step explanation:
The event that ended the Reconstruction Era, resolved the 1876 election, and removed federal troops from state politics was the Compromise of 1877. This compromise, also known as the Great Compromise, was an informal agreement between Democrats and Republicans that decided the disputed presidential election of 1876. In exchange for Democratic acceptance of Republican Rutherford B. Hayes as president, federal troops were withdrawn from the South, effectively ending Reconstruction and allowing Democrats to regain control of state politics.