Montezuma was too trusting and believed Cortez was a god just like the other Aztecs believed, if he wouldn't have been so trusting and fought the newcomers immediately the Aztec empire wouldn't have fallen to Cortez
I think it is Trench warfare.
Your answer would be:
C.It ended slavery, but it failed to guarantee the right to vote for African American men.
~<em>Luis~</em>
The answer is the second one