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Abraham Lincoln was the president and the Commander-In-Chief during the war, which is the highest military rank.
Ulysses Simpson Grant was Commanding General of the Union (North) along with Abraham Lincoln. Many people believe that General Grant was the commanding officer, so I would go with Ulysses Simpson Grant.
It was the "Sons of Liberty" that was the organization that specifically promoted support for the war against the British among the american people, mainly due to grievances over taxation.
To preserve the union and end slavery. hope i helped and if not sorry!!
