Answer:Sinking of American merchant ships
Explanation:In early 1917 Berlin forced the issue. Its declared decision on 31 January 1917 to target neutral shipping in a designated war-zone became the immediate cause of the entry of the United States into the war.
Can what? (Asking a question)
C because the 19 amendment is American women has the right to vote and the 13 amendment talks about slavery so that means it’s C
Answer:
a guess but I think the shifting of tectonic plates
Answer:
1. C
2. C
3. C
4. D
5. A
Not quite sure about the last one, hopefully it helps! :D