The civil rights act of 1866 was significant because it placed the south under military rule and created districts. granted all african american men the right to vote. prohibited states from denying the right to vote due to race. was the first in a series of laws that protected african americans.

I would go with the answer D, was the first in a series of laws that protected African Americans. 

The Act had nothing to do regarding millitary rule, and while it did discuss voting rights, the Act itself did not provide them. The act was designed to give all US citizens, regardless of race, civil rights and immunities.