The Cherokee Nation fought for the south under General Stand Watie.
the Civil War was not fought over slavery. State rights an taxation where the main issues. The Union had industry but the south had America's real money makers, tabacco and cotton...
the war raged on for two years. When the south was winning, being helped by England and France, slavery became an issue. making it an issue helped weaken the south. In Sept of 1862 the decree stating that unless rebellious states returned to the Union by January 1, slaves within those states will be grated freedom. Signed on January 1 1863, The Emancipation Proclamation did not free all slaves. only those slaves living in states NOT under Union control would be free. Slave states loyal to the Union were allowed to keep the slaves. those state were Kentucky, Missouri, Maryland, or Delaware.
Most people tend to forget that many southern Americans were abolitionists, did not own slaves (in fact it was a very small percentage that did) and would not have fought for the protection of slavery...
Confederate General Robert E. Lee had freed his slaves...
Union General Grant's wife Julia did not free her slaves until after the war when forced to do so by the 13th amendment to the constitution and court action.
In a book by Mildred Lewis Rutherford called Truths Of History
just another quote about the issue