These trends weren't an accident.
https://cdn.britannica.com/04/20904-050-AEC7F1A6/mass-vaccination-programs-diphtheria-polio-population-diseases-1970.jpg
https://cdn.britannica.com/04/20904-050-AEC7F1A6/mass-vaccination-programs-diphtheria-polio-population-diseases-1970.jpg
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https://jamanetwork.com/journals/jama/fullarticle/2827212
What is that bottom right chart?
It was the 2019 resurgence of measles in the US, in which declining vaccination rates played a role.