Why Mac amd Aedui? They were incorperated everything but peacefully but instead through war.
Pergamon, That city in N Africa, Massilia and Rhodos either joined the Roman Empire (were bequethed) or became allies that was slowly incorporated. Syracouse might have as well had the son followed the Old man's footsteps, but he did not so they changed sides and were taken by the usual Roman appliance of force. There are others I think, but I am a bit under the weather and thus forgetful, so look in my Roman Timeline.
In any case, unification should be extremely rare. IMO it should only happen if all FMs die or some such.
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