Answer:
The "Boston Massacre" caused the colonists to have hatred twoards britian and some people became either loyalists,patriots,or undecided(i forget what there called,lol) but they had diffrent feelings twoards they either supported them,hated them or was undecided.
Explanation:
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Https://www.whitehouse.gov/about-the-white-house/presidents/
Check this link hope this help
McClellan discovered General Robert E. Lee's battle plan.
Obviously, infiltration and access to battle plans allow for the opponent to figure out what their opponent's plans are, thus giving McClellan the victory at Antietam.
Hope this helps!