Traditonally USA staed out of affairs in the world (ISOLATIONISM)
Why? America was a strong and well resourced country and did not need to get involved.
After WW1 they wanted to get out of the problems
USA had been helping the allies before 1917. An US boat carrying good for other countries were sunk (U-Boats)
Such as the Lusitania
The Zinnerman Telegram - intecepted that Germany was backing Mexico to invade USA
America did not like Germany for this so joined the war
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