The US did try and close the borders. https://www.whitehouse.gov/presidential-actions/proclamation-suspension-entry-immigrants-nonimmigrants-persons-pose-risk-

The US did try and close the borders. https://www.whitehouse.gov/presidential-actions/proclamation-suspension-entry-immigrants-nonimmigrants-persons-pose-risk-transmitting-2019-novel-coronavirus/ https://www.whitehouse.gov/presidential-actions/proclamation... https://www.cnn.com/2020/02/02/us/coronavirus-us-travel-restrictions/index.html https://www.cnn.com/2020/02/02/us/coronavirus-us-travel-rest...