Many riots erupted in Northern cities as a result of
A. The thousands of northern men who died in the war thus far
B. Lincoln using conscription as a way to increase the number of Union soldiers
C. Lincoln issuing the Emancipation Proclamation, because many Northerners felt African Americans would
migrate North become competition for getting jobs
D. Lincoln failing to find a good leader to assign the position of Union General

C.

Explanation:

Although the riot was originally against the draft, it quickly became racially charged against black people. As the rioters believed that the liberation of black slaves and their subsequent migration to the Union would saturate the labor market, and create greater competition for white middle-class immigrant workers.

It is also worthy to note that the dependancy of NYC on the cotton trade with the South was also another reason for the general discontent against the draft and the war itself.

so they can defeat there oppenent

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.