How were the emancipation proclamation and the gettysburg address pivotal points of the civil war?

Emancipation Proclamation of January 1, 1863, freed all the slaves in rebellion areas. The acceptance of black men in the navy and Union army are also proclaimed. Emancipation Proclamation also persuaded the abolitionists in the North to Lincoln's side and gave him the advantage he needed against the South. The Gettysburg address is declared more or less that we are a unified nation, and not separated fighting against one another. 

You could solve them by trying something new that everyone can agree on or make a decision too.