It is because of the purchasing power of the American dollar. The country had to change personal wages, taxes, and cost of living for drastic changes. Im not 100% sure this is right but I hope this helps a little bit!!
John C. Calhoun supported the concept of nullification before the beginning of the Civil War. Nullification is the idea that US states have the right to ignore (invalidate) any law that they deem unconstitutional. This means that if a state thinks that a new law goes against a current constitutional amendment, they have the right to not follow it. The nullification crisis causes severe tension in Congress for decades leading up to the Civil War.
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The main reason that Austria-Hungary declared war on Serbia, and thus started WWI, was the assassination of Archduke Franz Ferdinand on June 28, 1914
