As of Feb. 11, 2021, the CDC reports the "Number of People Receiving 1 or More Doses" in the US as 34.7M.
On what date will this number reach 100M?
When will 100M people in the US have received at least one dose of COVID vaccine?
Resolves to the first date on which the "Number of People Receiving 1 or More Doses" at the above link is above 100M.
If the relevant metric stops being reported by the CDC, the Bloomberg Vaccine Tracker will be used to determine when the number of Americans who have received at least one vaccine dose reaches 100M.