Answer:
poison gases
warplanes
tanks
Explanation:
the gases would dissolve their insides they would cough so much their lungs would break down from the gas poison.
warplanes would drop bombs to kill the allis or axis groups.
tanks would shoot things for a farther distances to kill the people.
Southern and Eastern
So that the Panama Canal could be built. This would make it easier for the United States to move their ships from the Atlantic to the Pacific and vice versa.