WASHINGTON — One day after President Biden announced that he would instruct all states to make every American adult eligible to receive a coronavirus vaccine by May 1, his administration announced several measures to facilitate the ambitious goal, which has required unprecedented logistical organization.

“We need to make it easier for every American to get vaccinated,” said Jeff Zients, the White House coronavirus coordinator, during a Friday briefing with reporters on the state of the pandemic. “May 1 is an absolute deadline,” he reiterated, though there could be days or even weeks between a person becoming eligible to receive a vaccine and actually becoming vaccinated. That is bound to be