When was the last time the US banned all travel from another continent? Yes, I realize that the UK is the exception to the rule.
Has to be right after 9/11
After 9/11 I remember for 4 days all flights were grounded, but then as I remember they started up again.
Perhaps I should have asked when was the last time the US restricted all travel from a continent for 30 days or more? Perhaps during WWII?
I’m confident this has not officially happened before. Even during WWII there were still allies and neutral countries in Europe (in addition to the UK) and Asia. Travel may have been risky and difficult but it wasn’t prohibited.