What legal action during the Civil War ended slavery in states that had left the

Union?

A. black codes

B. Plessy v. Ferguson

C. Emancipation Proclamation

D. Reconstruction Act of 1867

Emancipation Proclamation

Explanation:

Emancipation Proclamation was a document consisting of two decrees of Abraham Lincoln issued during the American Civil War. The first decree, issued September 22, 1862, declared free all slaves in any state of the United States that did not return to the United States until January 1, 1863. The second decree, issued January 1, 1863, named 10 individual states that would be subject to the abolition of slavery.