To be fair the US acquired American Samoa and kept a lot of their law in place even to the point you can do stuff in American Samoa that would be unconstitutional like limit power of women in some of the tribal councils (sorry they have a better name but I've forgotten), do not provide 2nd amendment protections required inside the USA, and limit ownership of land based on ethnic lines.

The USA also for instance rehabilitated Philippines from Japanese rape islands into an independent nation by taking them as a territory.