US buying other countries?

Hey guys ive had this question im my head its prob never goin to happen so here it is is it possible that the US just tell a country(ex Kuwait or Kasakhstan) for the to join our nation and they would be a state then we would have 51 states everyone in that state would be american and we would rebuild that state into a normal state that we have here, what do you guys think I know its not going to happen but whats your opinion?