The americas started using african slaves, because the native americans
a.
were not good at mining gold and silver
b.
had reached a truce with the british
c.
revolted too much
d.
were dying from disease

d)to gain support for the independence movement.

hope this : )

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.