Well, it certainly wasn't lockdowns. Locking healthy people in their houses wasn't even a thing for the entire history of human civilization.
I think it was what was originally suggested and then poo-poo'd. Namely, herd immunity.
No, it certainly wasn't the lockdowns.
Could it be... the worldwide rollout of a vaccination program?
If not, what was it then?
Herd immunity? Really? just wow... How to tell everyone in the thread you know NOTHING about herd immunity without just directly saying it.
How well was your "herd immunity" working for the population until the vaccine came along?
Do you even realize or understand that "basic" issues like Measles are making a comeback precisely because herd immunity is falling, primarily because of less people being vaccinated against it now?
You seem to think "Herd Immunity" is only acquired when everyone susceptible to the illness dies off leaving only the "survivors".
We also "create" Herd Immunity through vaccination programs.