Answer:
Step-by-step explanation:
12. September 17, 1862, Battle of Antietam.
13. The Emancipation Proclamation. Black Americans were now allowed in the union army.
14. Because slavery had been outlawed in England 1833, and in France 1834. Because of the confederates reliance on slaves, they couldn't support them.
15. Gettysburg Gettysburg Campaign where the Union won.