Cuba, Philippines, and Puerto Rico.
The right answer for the question that is being asked and shown above is that: "black nationalism." <span>According to the Kerner Commission, the main cause of urban violence is that of black nationalism. Racial discrimination is very rampant during these times.</span>
An all-American Expeditionary Force which was organized in WWI was perhaps considered as less challenging to fight than say a British force at least when they initially went into battle until they gained experience as they did not appear to have as much fighting experience as say the British or French who I believe entered the war earlier.
I belive it was the Battle of Midway in June 1942.