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The war that made Maine a state
Indeed. Most US folks don't know what-all happened around 1812. In part because everybody on both sides was messed-up.
In short-- at the time of the Treaty Of Paris, 1783, ending the revolt started ~~1775, upper inland Maine was deep woods, poorly explored, just starting to be exploited. Boundary line was not clear. As both the US and (what became) Canada grew, it became disputed. For her own reasons, England claimed and occupied large areas of what the US thought was its own. Major naval battles on inland lakes. The burning of our national capitol.
Much "US pride" comes from snippets of the 1812 war. Many of our stirring patriotic quotes come from that period. The "Star Spangled Banner" is not about 1776, it celebrates a minor moment in the 1812 war. There was some tradition of gunpowder for 4th July, but the navy vs fort confrontations around 1812 really firmed-up the fireworks tradition.
Everybody was profit-taking. England took the Customs House at Castine Maine, charged so much duty on goods obviously being smuggled into the US that they founded a college with the proceeds. Smugglers even hired an English war-ship for escort and mock battle. Messed-up all around.
Other historians count 1812 as a minor side-plot of the Napoleonic Wars. Here in Maine (and such of the US which knows), we consider 1812 as a direct attack on "us".