In 1863, african american involvement in the civil war changed due to a new law that

The right answer is B. permitted African Americans to enlist in the military.

The civil war was marked by political and economic differences between the North and South regions of the United States.

In 1863 the most important battle took place, the Battle of Gettysburg, which secured victory for the Union forces. Lincoln then decreed the abolition of slavery throughout the country and with it was allowed the enlistment of blacks in the military that before it was forbidden, which only came into force with the end of the fighting and the definitive defeat of the South in 1865.

Explanation:

would not cooperate with each other voluntarily.

d) the constitution rights of native americans and their right to self-government on reservations