Final answer:
The Civil War Amendments—13th, 14th, and 15th—were key in abolishing slavery, establishing citizenship, and securing voting rights for African Americans, transforming their legal status in American society.
Step-by-step explanation:
The 13th Amendment was a landmark in American history, abolishing slavery nationwide and thus beginning the process of extending equal rights to African Americans. Following this, the 14th Amendment was instrumental in establishing citizenship for African Americans and ensuring equal protection under the law, making it illegal for states to deny any person life, liberty, or property without due process. The 15th Amendment targeted voting rights specifically, prohibiting the federal government and each state from denying a citizen the right to vote based on that citizen's "race, color, or previous condition of servitude." These amendments collectively sought to integrate former slaves into the fabric of American society as full citizens with rights and protections.