Answer:
As the United States' industrial economy grew in the late 1800s, conflict between workers and factory owners became increasingly frequent and sometimes led to violence. The Homestead Strike occurred at the Carnegie Steel Company's Homestead Steel Works in 1892.
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So basically bud they declared war because Germany had sunk the Lusitania and was therefore trying to abandon the policy against unrestricted submarine warfare
Boston Tea Party and the Townshend Acts
