The oldest of these three religions is Judaism, founded by Abraham.
Christianity sort of branched off of Judaism and was founded by Jesus.
Islam, founded by Muhammad and is sort of a Judaism/Christianity hybrid.
One is the 3/5th compromise, which stated that 3/5th of a slave owner's slaves could be counted toward the population.
Another is the Missouri Compromise, which admitted Missouri as a slave state and Maine as a free state. It balanced out the number of slave and free states.
The Battle of Appomattox Court House, fought on the morning of April 9, 1865, was one of the last battles of the American Civil War.