This was a quote after WWI, the "war to end all wars". At the end of the war, Germany was basically blamed for the war in the Treaty of Versailles. They had to pay an immense amount of money to the other countries. In WWII, Germany got its "revenge".
<span>the reason why Truman put limits on MacArthur was : d. he was unhappy that MacArthur moved north of the 38th parallel
When MacArthur did this, it created a conflict with north korea. Truman worried that MacArthur's move will potentially caused China and Russia to join forces and attacked united states</span>