In hindsight, it's easy to say now that our chances of being invaded during WWII or having our freedom threatened had a 0% of happening.Without wading into politics, again, I disagree with your assessment of the WWII era. First, lots of executive orders setting domestic policy. Quite frankly, executive orders are just more nimble than the legislative process in emergency situations. Secondly, the United States had a 0% percent chance of every being invaded or having its freedom threatened by the Axis. If there was a percentage less than 0, I'd go for it.
And to echo the parody of Oliver Hazard Perry's quote, "We have met the enemy, and it is us." For reasons that escape rational explanation, our entire domestic response to a global pandemic are being defined by two groups, "Orange Man Bad" and "Orange Fan Mad." It's inexplicable and disastrous.
However,, that is not historically accurate. Nazi subs operated off our Atlantic seaboard prior to the start, and during, WWII. Shipping was disrupted and, in fact, channel islands were created along the Atlantic and the Gulf of Mexico to allow safe shipping, with the ability to stop enemy subs from penetrating.
Hawaii certainly had more than 0% chance of being invaded, and the Aleutian Islands WERE invaded, so American territory was breached.
On both coasts, there were lookouts posted. California was most definitely poised for an invasion, as much as today's generation mocks their fears.
To sit here today, look back on our victory, and feel secure in our isolation, it's easy to assume there was no chance of invasion. I assure you there was no such confidence in the early 1940s, when rationing was in effect.