--and they did a bad job of it. We agree.
It kind of sounds like you're almost saying (but afraid to actually say) that the roles are reversed now the U.S. is allowing "foreigners to freely move in" and just like in 1821 Texas we'll end up w/ an overwhelming majority of Mexicans in Texas and just like 1836 they'll resist a military coup in Washington by raising an American flag at the Alamo w/ the constitution's date 1787.
imho that seems pretty unlikely but if it did happen given my dislike for military dictatorships I might me tempted to join in..