During the revolutionary war, the colonists/rebellions fought against the British King's army, for Independence. Many sought over their liabilities. All this erupted because the British King at the time made unlawful taxes for the Americans. These were bounded because the British felt it was necessary after they had fought for both the Indians and the French. Seeing that they paid their dues and fought on American soil, they pressed unfair taxes on them. This created a lot of controversy, which then formed the group.
The Americans wanted to define their own colony, to become independent. This was achieve in July 4 1776, when the constitution finally had it signed. Marking a new era in American History.
I hope this helped :)