The correct answer is A. End of slavery in the United States
Explanation:
One of the factors that caused the Civil War (1861-1865) were the differences people had regarding slavery, this occurred as the states in the North or Union opposed slavery while those in the South that formed the Confederacy promoted slavery as this was necessary for the plantations in the South. Due to this, during and after the war slavery was one of the main issues addressed.
Indeed, in 1963 Abraham Lincoln issued the Emancipation Proclamation that declared slaves were free which caused many slaves to escape to the North. Additionally, as the Union defeated the Confederacy this was ratified in the Thirteen Amendment (1865) that abolished slavery in all the United States. Therefore, the one that was a result of the United States Civil War was the end of slavery in the United States.
