Which of the following best describes the state of the us economy at the end of world war 2

After World War 2, the U.S. emerged as a world superpower and our economy was booming. Our nation was extremely rich, basically.

The league of nations was found in 1919 to keep peace after world war l.but it failed to prevent world war ll in 1939,so in 1945 the nations of the world set up a new organization,the united state (un).since then, the un has encouraged international cooperation and worked to resolve conflict