What have been the three most influential changes in U. S. society since the end of World War II?

The main 3

shortages

bombing

tents

Explanation:

Shortages of manpower. That's why in Germany (and many other countries) after the war women were used to clear the streets of rubble. Shortages of accommodation. Bombing raids on cities and towns meant that people who's homes had been destroyed lived in temporary accommodation like army barracks and tents.