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a border surrounding the zone of strong gravity near a black hole.

Explanation:

The event horizon is the place where the gravity begins to become so strong no light can escape the gravitational pull of the black hole. The event horizon is also known as "the point of no return" because it is impossible to escape the gravitational pull at that point. Light and matter begin to stretch and be pulled into the center and compressed into the matter that makes up the black hole.

basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.

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.