OK and? The only way to have actually stopped the virus there would have been a global lockdown with 100% participation. That will never happen. The virus was virtually guaranteed to enter the U.S at some point and spread, just because of the way our globalized world works. The only real, effective strategy is to get the means to stop it into the hands of those willing to use it and let the rest to deal with their lives.
Yes, containment and delay with lockdowns was on the table and it worked to buy time for the teams developing vaccines, but there was no real good choice at that point. I mean, can you imagine if Trump went 100% in on lockdowns? The left would have blown their collective top at how fascist he was, how he didn't respect personal responsibility, how he just wanted to drag the country down with him, etc you get the picture.