Why did lincoln issue the emancipation proclamation? choose all that apply.

to force the north to be more serious about the war.

to shorten the war.

to gain support of non-slave nations.

to frighten the south by encouraging slave rebellions.

to strengthen the union cause.

The correct answer is: To shorten the war, To gain support of non-slave nations, To frighten the South by encouraging slave rebellions, To strengthen the Union cause.

Lincoln's hope was that emancipation, though not legally enforceable, would frighten the south, mobilize the north, encourage slave dissent in the South, and get abolitionist countries on board with the North.