Why was it important for the colonies to unify against the british? what was the purpose of this unification?

i believe it is the second one.   if correct plz mark brainliest.

i do not believe this was true indefiantly the native americans would have lsot aganist america one they didndt have the resources and allies that america had and 2   indians werent as advanced at the time as they were not 3 americans had the expreince because some of the soliders from other wars fought in that war and were attecked etc