Answer:
The machine gun, had been so refined that they changed the nature of warfare. Tanks and airplanes had a big impact on mechanized warfare, or warfare that relies on machines powered by gasoline and diesel engines.
Explanation:
The United States prospered greatly because of high demand for goods and services. They also benefited from lack of damge from the war. The Marshal Plan and Social Welfare Programs were a benefit for the Western European countries. Japan highly benefited from strong export sales and strong American support.
