Answer: cane sugar
Explanation:
It is cane sugar. They would have a good climate to grow it.
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Answer:
C. Trench warfare
Explanation:
A's incorrect as alliances have existed for thousands of years
B's incorrect as an infantry charge's greatest weakness is the machine gun for obvious reasons
D's incorrect as both sides had machine guns, and was not the reason for victory.
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This leaves C, which makes sense as troops would be forced to hide on lower ground due to the deadliness of machine guns
It was primarily the "Reconstruction Act" that forced states to accept the Fourteenth Amendment in order to join the Union, since this led to a military oversight of the Southern states immediately after the Civil War.