Pretty much every measure taken against COVID had been taken many times before during the numerous epidemics of cholera, typhus, yellow fever, bubonic plague, smallpox, and influenza that plagued (no pun intended!) the US since its founding.

Requiring inoculation/vaccination, shut downs, masks, and quarantines was generally considered a legitimate use of state power to prevent the spread of deadly diseases and not an infringement of civil liberties.

Actually this goes back to even before the US was founded. George Washington imposed mandatory smallpox inoculation on his army during the revolution. This probably contributed significantly to his victory because both the British army and native tribes that had sided with the British were heavily weakened by smallpox but Washington's was not due to that inoculation requirement.