I'd say Americans won't be allowed to travel to any country for the longest time.
A lot of Americans still believe one or more of the following: that masks don't work, that the tests are turning in false positives, that hospitals are faking the high incident rates, that it's all a hoax by the democrats to get Trump out of the office. They insist that living in the Land of Free, Home of the Brave means they have freedom not to wear a mask and courage to face down the virus.
Travel outside the country? I don't even know when I can eat outside my house!
Which would explain why we have the highest incidents and I will be in lockdown (except for groceries and other essentials) indefinitely to stay safe. I braved one masked trip to the used bookstore after it re-opened, which was very careful about not letting in too many people, but realize that is an unnecessary risk so probably won't even do that again.