Because the U.S declared that the people of Kansas and Nebraska can vote on to be a slave or free state, in this case northerners rushed there to make it a free state, this whole thing also caused bleeding Kansas
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The part that particularly angered Northerners was that if they did not enforce the act, they were subject to jail time or a fine. Even if Northerners opposed slavery, they could still be neutral in terms of what they do to help slaves or not. The Fugitive Slave Act forced them to go against their own beliefs with this potential jail time or fine, which really angered them.
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Lusitania was an important event in World War I. The death of so many innocent civilians at the hands of the Germans galvanized American support for entering the war, which eventually turned the tide in favor of the Allies. The Lusitania was a British luxury cruise ship.