Final answer:
The Thirteenth Amendment, ratified in 1865, legally abolished slavery in the United States, and the Fifteenth Amendment, ratified in 1870, granted voting rights to all Black men.
Step-by-step explanation:
Emancipation and Constitutional Amendments
President Abraham Lincoln supported the abolition of slavery, which led to the Thirteenth Amendment, passed by Congress on January 31, 1865. Ratified by the requisite number of states by the end of 1865, the Thirteenth Amendment legally abolished slavery in the United States, except as punishment for a crime where the party had been duly convicted. Subsequently, the Fifteenth Amendment, ratified on February 3, 1870, granted the vote to all Black men, thereby giving formerly enslaved people and free Black people greater political power. This included the election of Black U.S. congressmen and local and state leaders who initiated reforms in the South, although women were still excluded from voting, leading to continued suffrage movements.