Final Answer:
Post Civil War (after 1865) corresponds to the Reconstruction era. the correct option is a) Reconstruction era.
Step-by-step explanation:
The correct option is (a) Reconstruction era. After the Civil War, from 1865 to 1877, the United States entered a period known as the Reconstruction era. This phase was marked by efforts to rebuild and reunite the country after the Civil War, address the issues of emancipation and civil rights, and reintegrate the Southern states into the Union.
The Reconstruction era followed the Civil War and aimed to address the aftermath of the conflict. Key goals included rebuilding the Southern states, establishing civil rights for freed slaves, and determining the terms for readmission of seceded states into the Union. The period was characterized by significant political, social, and economic changes, including the passage of constitutional amendments and the introduction of federal policies to reshape the South.