Answer:
The World War 1 experience impacted hugely on U.S. culture, domestic politics and society. The war also resulted in an increased demand for weapons abroad. This led to increased profits and heightened productivity in the American steel industry. World War 1 ushered in an era of using chemical weapons.
Assuming that this is referring to the same author that was posted before with this question, the correct response would be "<span>(1) efficiency and education"</span>
Power and wealth fueled warfare in Feudal Japan, <span>Feudal estates sent knights to the Holy Land in the Crusades for religious reasons.</span>