In 1863, african american involvement in the civil war changed due to a new law that
a. required freed african americans to join the military.
b. permitted african americans to enlist in the military.
c. required enslaved african americans to join the military.
d. forbid african american from enlisting in the military.

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.

i think it was   tsar alexander ii