There is evidence that social distancing helped. I'm not sure about masks specifically. https://qz.com/1816060/a-chart-of-the-1918-spanish-flu-shows-why-social-

There is evidence that social distancing helped. I'm not sure about masks specifically. https://qz.com/1816060/a-chart-of-the-1918-spanish-flu-shows-why-social-distancing-works/ https://qz.com/1816060/a-chart-of-the-1918-spanish-flu-shows...