C. OAU. Organization of African Unity (OAU) had nothing to do with America.
The U.S. invaded the Caribbean island of Haiti (B) in 1994 until 1995 in order to reinstall a new government in Haiti following the 1991 coup d'etat which overthrew a democratically elected leader.
The Confederacy saw themselves as fighting a second war for independence. They were rebelling against what they felt was an oppressive government that was infringing on their rights.
Lincoln referenced the forefathers in his Gettysburg Address and felt that keeping the union together was what they had fought for, they created a new nation, not one that should be torn apart.
Speaker of the House and Lieutenant Governor