Final answer:
The 13th, 14th, and 15th Amendments are known as the Reconstruction Amendments, which abolished slavery, granted citizenship and equal protection under the law, and secured voting rights for African American men, respectively.
Step-by-step explanation:
The 13th, 14th, and 15th Amendments are collectively classified as the Reconstruction Amendments. These were instrumental in establishing civil rights and liberties following the Civil War. The 13th Amendment abolished slavery in the United States, radically altering the social and economic structure of the South. The 14th Amendment granted citizenship to all persons born or naturalized in the United States, including former slaves, and it mandated equal protection under the law regardless of race. Finally, the 15th Amendment secured the right to vote for African American men, signaling a significant change in American politics by attempting to enfranchise a previously disenfranchised group.