We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable rights
- Declaration of Independence, 1776
The excerpt refers to rights people -- (8.19A, 8.29A)

the emancipation proclamation was the aim of the war change to include the freeing of slaves in addition to preserving the union. the 13th amendment, which abolished slavery in the u.s. was passed on december 6th 1865.

as promised, lincoln waited to unveil the proclamation until he could do so with success from the union military advance. on september 22nd 1862, after a victory at antietam, he publicly announced a preliminary emancipation proclamation, declaring all slaves free in the rebellious states as of january 1st 1863.

the united states broke it's neutrality was the constant german sinking of trading vessels resulting in the loss of lives, one example would be the lusitania.

what is the full question?

a. all people should come together to heal the nation.