"There are two ways that you can gain territory from another group. One is by conquest. That's essentially the way we took California from Mexico and... Texas as well. But what's going on now may end up being a kind of recolonization of the Southwest, because the other way you can regain territory is by population infiltration and demographic dominance.... The United States will be faced with the problem that Canada has been faced with... and which our system is not prepared to accommodate."

Source : Source: abcnews.go.com

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