<span>C.) many of the blacks fought for the North
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This was caused by the emancipation declaration by Lincoln. Lincoln believed that the emancipation would weaken the confederation forces as it denied them manpower for the war. The emancipation was therefore a military strategy to defeat the south. the blacks therefore joined the union course serving in different cadres in the union army.
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Moral diplomacy was more common near the Panama Canal and it affected the stick diplomacy.
The biggest factors would be food and water.
There are more than three reasons why this happened of course but the best three are there they needed more land, resources, and some way to escape the cold.
