During the First World War, the group of Americans who faced hostility were the German Americans.
During WWI:
- Germany tried to get Mexico to attack America
- America joined the war on the side of the British against the Germans
As a result of this, many Americans began to see German Americans as the enemy and this led to a lot of hostility towards them that sometimes became mob violence.
In conclusion, German Americans faced a lot of hostility during WW1.
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