The United States could have been motivated by a few reasons... 1) The strategic location of Korea- Korea is located between Russia, China and Japan giving its position great strategic importance. 2) Communist Agression- This was a war caused by communist agression, and the US was no doubt afraid of a domino effect going off all throughout Asia.
To gain Arizona and New Mexico from Mexico
From what I can see, Germany's unrestricted submarine warfare policy, and the sinking of two american ships without warning is what motivated America to go into the war. Once again this is from what I can see on google lol.
Which war?
The US did enter World War 1, though not till 1917.
Africa
the us decided to enter world war because they want the resources of France, and they want to keep on ruling france.
The US entered the war in April of 1917 and were on the Allies side.
The Vietnam war
the us decided to enter world war because they want the resources of france, and they want to keep on ruling france.
The US entered the Korean war in order to protect South Korea
1917
no