Yes, the U.S. is also a colonial state. Not all states owe their existence to colonialism and occupation, but the U.S. is definitely one of them. We committed a genocide on an unimaginable scale, and took all the line of the people whose territory this was rightfully theirs. Not a good example of states to emulate.
> How about West Europe? Maybe it should be dismantled and have all it's assets transferred to Africa?
Its colonial territories in Africa should have been, and were, transferred to Africa.