People of the United States have got very much smarter as compared to 1945. They know when to oppose the decision of waging a war against Vietnam and when to support the government to go to war against Cuba.
The cold war is beneficial in some things for Americans such as their lives being full of humor due to Soviet jokes. They got united against one mighty enemy and contributed a lot in various fields.
The USA became a real superpower by inviting foreign investors, establishing diplomatic relationships, researching, and taking a stand on almost every political event.
Now as the USA has achieved more development and power than any other nation, they have gigantic things at stake and have something to lose. New rivals are arising.
The corporations Freddie Mac and Fannie Mae helped to guarantee private home loans. James B. Lockhart III was the director of FHFA or Federal Housing Finance Agency in the year 2008 and he decided to give two government sponsored enterprises Fannie Mae and Freddie Mac into conservatorship of government enterprises. Fannie Mae was founded in the year 1938.
The answer is working in wartime industries. Hope that helped!
The U.S wanted to remain neutral, based on what Woodrow Wilson wanted, but after Germany started sinking U.S ships, they got included.