It's definitely not A) bc aircraft had not begun flying yet! I would say C) to protect national interests
The U.S. needed naval ports in the Pacific because:
a. The U.S. found competition with the merchants of France and Great Britain.
b. These merchants would prevent other countries from trading with territories
they controlled. c. The U.S. built their own ports along their route to trade.
The south didn't grow crops very much, instead they grew cotton which made them rely on the North for crops and other materials. So the correct answer would be "B" since that seems like the most plausible answer.
