The Act Prohibiting Importation of Slaves of 1807 is a United States federal law that stated that no new slaves were permitted to be imported into the United States.
Treaty of Ghent
United States and England agree to try to end the slave trade in Treaty of Ghent.
The Missouri Compromise
Following the addition of Missouri (a slave state) the Missouri Compromise was made so there wouldn't be an unbalance in amount of slave states vs free states represented in the US Government. The Missouri Compromise added Missouri (slave state) and Maine (free state) to the union.
New York Emancipates
Rhode Island freed all slaves within its borders
The Turner Rebellion took place in Virginia during August of 1831. It was the largest slave uprising, led by Nat Turner the rebellion killed more than 50 people.
1836 - 1844
A series of congressional resolutions that tabled, without discussion, petitions regarding slavery
Elijah P. Lovejoy was an abolitionist editor who was murdered due to mob violence against him. His death advanced the Northerners fight against slavery.
Rhode Island Emancipates
January 1, 1863
The Emancipation Proclamation granted freedom to the slaves in the Confederate States if the States did not return to the Union by January 1, 1863. In addition, under this proclamation, freedom would only come to the slaves if the Union won the war.
Official End of Slavery (US)
Slavery was formally ended in the United States in October 1865 with the ratification of the 13th amendment.