Very long story short, farming and sugar, as well as a port to china, east india and asia. and the islands were a prime place for a navel base.
I think its a) one event happened only as a result of the other
Answer:
The Civil War took place between 1861-1865. The North did not support slaves while the South did. The North was led the Former President Abraham Lincoln and Ulysses Grant and the South by Robert E. Lee. This war had the most American casualties and the North won although the couth could have won if King Cotton had been successful.