Many pundits to the Right of the political spectrum make much ado of the barbarity and fanaticism of the Muslim Terror elevating these savage clowns to the status of a serious invasion threat of the Continental US and to the Constitution itself. To the level we once associated with the Axis and the Soviets.
We lived under the nuclear gun for forty years, which circumstance elevated national security as the primary focus of national policy, overshadowing all other considerations. The Fall of the Wall and the end of the Soviet Empire is missed by all who need a Villain in their lives to use for personal pleasure and gain. And who would love to circumvent the Constitutional Rights embodied in our Constitution. And True Believers exist at both ends of the political wind machine who are straining at the leash to do.
The fact is that the Muslim Terrorists are a serious pain in the ass, but hardly a serious threat to the Continent and constitute a threat to the Constitution only as a blow back from those who take them too seriously. No way is the entire Caliphate from Morocco to Indonesia, all together and united going to be able to mount sufficient naval warships and transport to land a force big enough to overwhelm the US.
Consider the avenues of approach to the US to get to our coasts or to the Mississippi. The Asian Axis must include control or neutralization of Japan and Kamchatka Peninsula to able to approach Alaska. The avenues of approach to the US from Alaska either must penetrate the wall of mountains at some point between Alaska and the Mexican border or risk constant level of threat from their eastern flanks. Once in Washington State, California must be controlled, likely from the sea, which advance is restricted by the Sierra Nevada, the Rockies, and the Great Plains before being able to strike home.
The Atlantic Approach likewise must control Great Britain, Iceland (as in Red Storm Rising), and go for Newfoundland before reaching the St Lawrence River. It was this avenue of approach that worried FDR should England have fallen to Hitler. He asked Churchill to turn the Royal Navy over to the US should that happen. Churchill said no in very certain terms.
That time frame was more dangerous than we give it today given the fact that we won and no threat appeared. If the French fleet had gone over to Germany and Germany had landed in England, there were British who would have welcomed him, including Edward former King of England. A combined European fleet of Germany, France, Italy, and the Royal Navy would have had the necessary power to support landings in the US. And they would have been supported by an Axis fueled by Soviet Oil. Hitler’s invasion of Russian ended those options.
A Soviet invasion of Europe would have hadto consolidate it’s gains in the same areas and would have had to have the same relative naval power to have ventured against the US that a combined European Fleet under German control. And then venture across the North Atlantic, seize Newfoundland, and the mouth of the St Lawrence before taking on New England.
It becomes obvious that the best chance an invader has is to have substantial support from within the US. Substantial enough to control or seriously disrupt key segments of the nation including at least one of the top three: West Coast, Union, and/or Mississippi. Such an event would need to replicate the inner divisions of such nations at war such as France in 1940 where the pro-German faction was equaled by the Communists who, at that time were allied with Germany.
It is easy to consider a Red State - Blue State division in the face of an invasion, but hard to predict who would favor who. It would depend on the perception of legitimacy of the extant US government, and upon which end of the political wind tunnel blew first. And the high ground would be the rights spelled out in the Constitution, particularly free speech and assembly and due process.
Beware of the Blow-Hards.