However, should Mexico fall to a leftist regime, and an independent Quebec go Marxist, there would then exist land bases from which to stage an invasion. There are several areas of instability that could be exploited to cause a high level of civil strife and maybe even a second civil war. These include many millions of unassimilated illegals who may be made "legal" in the near future; networks of radical Muslim terrorists, not all of whom are Middle Eastern, but could also be white (as with the Albanians recently charged with trying to attack Fort Dix), Asian (Indonesian and Malaysian), or black (the Beltway snipers); militant non-Muslim blacks like the New Black Panther Party; hard core Marxists like the Worker's World party or Act Up; and "faux right" white separatist militia groups, infiltrated by Muslim or Russian agents. Combine these factors with either a weak kneed liberal Administration like one under Obama or Edwards or a heavy handed Administration like one under Hillary that would try confiscating private firearms and purging the military and Federal law enforcement agencies of conservative personnel. There could then be a breakdown of civil order in this country or even a civil war that would provide cover for foreign intervention.
There are a lot of "ifs" and "maybes" in the above scenarios. However, vigilance is always necessary so that it will not happen here.
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If I were the Commander in Chief, I would have every soldier, and every federal police officer, stand in formation every day and recite a portion of the Constitution and Declaration of Independence so that every few months they would have recited all of it. I would add to this the military pledge to uphold the Constitution.
There would be no excuse for them not knowing the Constitution, and their lifetime pledge to see that it stands.