The British had imposed limits to the border, they even actively prevented colonials from traveling further west, after the Revolution the expansion really began. Also slavery continued in America right up to the civil war. A lot of African Americans fought for the British as they had been promised freedom.
Contemporary historians painted the American Revolution as a struggle for freedom by an oppressed people, but in reality the rebels had much to gain in terms of financial wealth and freedom to rule as they saw fit. One of my favourite Hollywood revisionisms is the film 'the patriot' with voice of the christians mel gibson, for its unashamed 'artistic license' turning a racist rapist into a hero of the people.
In the end, the ballot must decide, not bullets Jonas Savimbi
Democracy is when the indigent, and not the men of property, are the rulers Aristotle