Measles charts (US) [1] Line goes down to nearly zero and stays there.

Polio chart (US) [2] See the line go almost straight down to 0 after vaccine introduction and stay there.

Smallpox has been totally exterminated by vaccination.

Any questions?

[1] https://ourworldindata.org/grapher/measles-cases-and-death

[2] https://ourworldindata.org/grapher/prevalence-of-polio-rates...