The first shot was the mark of the american revolution, a critical part of american history. The Colonists winning the war, alongside the French, marked America as an independent country. More importantly, these shots marked one of the first times that The British Empire faltered.
Explanation:
Robert C. Weaver
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It relieved it because the idea made it possible for individual states to democratically vote and choose whether or not their state will be a slave or a non-slave state. Of course, there were states where slavery was democratically chosen, but there were those who didn't support it too.