Let’s say you only vaccinated 150 or 200 million people, that’s 300 to 400 million doses if you use just the current to vaccines, add in the Johnson and Johnson vaccine once it’s approved and that cuts the number down significantly because it only takes one dose....
Regardless, manufacturing that many doses, get them all distributed and administered to that many people is a major task.....
How about starting with mandatory vaccination popups along the border. There are millions who are coming here at risk of spreading the disease.