Like so many other countries and societies throughout history, America has always been plagued more by the ‘enemies within’ than those without. The quote generally [mis]attributed to Cicero certainly applies with force:

A nation can survive its fools, and even the ambitious. But it cannot survive treason from within…

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Perhaps Abraham Lincoln best summarized our American destiny, as true today as it was then in 1838:

Shall we expect some transatlantic military giant to step the ocean and crush us at a blow? Never! … At what point then is the approach of danger to be expected? I answer. If it ever reach us it must spring up amongst us; it cannot come from abroad. If destruction be our lot we must ourselves be its author and finisher. As a nation of freemen we must live through all time or die by suicide.