Nullification is where a state has a right to disagree with a federal law they think is unconstitutional and not correct, and no longer abide by it. Nullification would have weakened the Union because states would no longer have to agree or act on certain laws, causing obvious conflict within the state and conflict between Congress and the state. The state would no longer be unified and a quarrel between people in the state, the states, and between the state and the Congress would deepen and would most likely lead to war and weaken the Union.
St. Augustine is the oldest occupied city of the United States. It was found in 1565 by Pedro Menéndez de Avilés. The fort defended the trade route between Spain and its colonies. It would also defend the Spanish-claimed land against invasion.
In 1692 the Queen ordered to build a stronger fort, replacing a wood one with a shell stone one. It was used as a refugee for Loyalists to the Crown during the American revolution, served as a prison during the Indian wars, and was a battle site during the Civil War. And it still stands, so it's pretty much indisputable.
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I think the answer is 3. New York's economy benefitted from Southern cotton, and were sympathetic to the South.
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