The three significant amendments made to the U.S. Constitution after the American Civil War that ended slavery are:
- The 13th Amendment - which abolished slavery.
- The 14th Amendment - which granted citizenship and equal protection under the law to all persons born or naturalized in the United States.
- The 15th Amendment - which granted African American men the right to vote.
The correct choices from your list are:
- The 13th Amendment
- The 14th Amendment
- The 15th Amendment