What does the phrase “checks and balances and separation of powers” mean

The Constitution divided the Government into three branches: legislative, executive, and judicial. ... Just like the phrase sounds, the point of checks and balances was to make sure no one branch would be able to control too much power, and it created a separation of powers.

Explanation:

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.