> The American Revolution was absolutely leftist in the traditional sense right as "support of the monarchy" or conservative and left as "royal abolitionists" or progressive.

But that wasn't it at all. They didn't revolt "because kings are shit", they revolted because they believed the British parliament (where the anti-royalists had won against the royalists in the English civil war) didn't give them adequate representation. It was motivated by an unbalanced relationship between economic ability and political participation, not because of ideology.