You might also cite Australia, new Zealand, and Canada as cases where "settler colonialism" made an orderly transition to independence. One lesson that a historian might deduce is that orderly transition is easier when the indigenous population is either exterminated or utterly marginalized. That's not a guarantee of orderly transition (didn't work with the US) but it seems conducive to orderly transition.
Fortunately settler colonialism is no longer in vogue, so there's nobody left to apply that particular lesson!
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