Reconstruction: After the Civil War, Reconstruction was the period when efforts were made to rebuild and reunite the United States, addressing issues like slavery, civil rights, and readmitting Confederate states into the Union.
Emancipation Proclamation: The Emancipation Proclamation was an executive order issued by President Abraham Lincoln during the Civil War that declared all slaves in Confederate territory as free.
Union Army: The Union Army referred to the military forces loyal to the United States government during the Civil War. They fought against Confederate forces led by General Robert E Lee.