Immediately following World War II, the United States and the Soviet Union entered into a Cold War, so the answer would be "escalating <span>tensions with the Soviet Union"
One of the main reasons why the United States wanted to continue to participate in the international arena after World War II was because tensions between the United States and the Soviet Union were escalating. The United States was worried that communism was going to spread throughout Western Europe and the world, and they believed their duty was to stop this and instead encourage capitalism and democracy. The only way to do so was to remain active in international affairs.
It increased the demand for coal and iron. we need the iron to build things and the coal to power things. Remember coal is what powered the steam engine.
