If you're referring to the tariff of 1812 (the tariff of abominations), south carolina did not approve because they stated it was unconstitutional.
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More Americans opposed Germany due to their use of unrestricted submarine warfare.
The Lusitania was a British ship that was sunk by German troops. Among 1200 passengers who died in the attack, 128 were Americans.This angered the Americans, who condemned the attack on an unarmed passenger ship without prior warning.
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