The answer to this question is:
Atomic Bomb
When we won world war 1 it gave a huge boost in American pride but indeed America still wanted to focus on itself. Most Americans felt that Europe could rebuild itself (which was horribly wrong and set things up for the rise of Hitler and the start of world war 2.). The American people also felt that Americans should not have to fight and die in foreign wars and that since they were across the Atlantic they didn't need to worry about their affairs.
Answer:
On August 14, 1935, the Social Security Act established a system of old-age benefits for workers, benefits for victims of industrial accidents, unemployment insurance, and aid for dependent mothers and children, persons who are blind, and persons with disabilities
People act in their own best interests to secure their own wills.
Remember Hobbes thought people were bad...
