People believe that the war lasted four years .
Answer:
Checks and Balances
Explanation:
The checks and balances system works like a parent in some ways, you can go do some things but others your not allowed to do. It helps keep all branches of Government "in check" so no one person can become more "important" than the other.
During the post war era, the U.S. and other countries tried to make the world better by creating jobs for their people. They had the means of fuel and other natural resources. Factory jobs and many other blue collar jobs were created.
All of the above is your answer.