While I concede that higher traffic would account for a higher initial infection rate due to travel cases, most of the cases currently in the U.S. are through community transmission. In that department too, the U.S. has not done a very good job on the federal level. With the resources the U.S. has, the federal government could have done so much more to raise awareness about the risks of the disease instead of minimizing the problem, even after cases were identified on U.S. soil.
Border control, while could have been better, was not the main issue. Everything else after that is the issue. Lack of preparedness when it comes to PPE and ventilators, minimizing the risks, pandering to right leaning states by pointing fingers at other cultures, and now, encouraging people to gather and protest lockdowns. That is just criminal in my opinion. It’s inevitable that some of those people will get infected and possibly die.
Even just implementing rules for supermarket shopping (see the Curfew section) would have been a huge help in keeping this under control.