What was a primary result of the compromise of 1877 a. the rise of southern terror groups b. the defeat of rutherford hayes in a contested election c. the lifting of a ban on ex-confederates running for office d. the removal of troops from southern states e. the implementation of new rules for the electoral college

D. the removal of troops from southern states

Explanation:

The "1877 Commitment," which secured the victory of Republican candidate Rutherford B. Hayes for the presidency of the United States, resulted in the end of military intervention in the southern states and the fall of the last radical governments in the region, ending the period known as "Reconstruction ".

4 copper and gold, the california gold rush is why im pretty sure.