What became critical to protecting what blacks were achieving?

The 13th Amendment, which was ratified in 1865, abolished slavery. Three years later, the 14th Amendment provided blacks with citizenship and equal protection under the law. And in 1870, the 15th Amendment gave black American males the right to vote.

Explanation:

battle of saint-mihiel, (12–16 september 1918), allied victory and the first u.s.-led offensive in world war i. the allied attack against the saint-mihiel salient provided the americans with an opportunity to use their forces on the western front en masse.

explanation:

answer: alexander the great

explanation: