[ghaff]

>We did something similar in 1918,

I looked at this a while back and, as far as I can tell, there were relatively limited interventions in the US. If you read beyond the headline of this link [1], for example, it doesn't seem as if you had much in the way of workplace closures and, in general the "non-pharmaceutical interventions" were for a fairly limited period of time. This study concludes they helped but the data is inconsistent and hard to interpret.

[1] https://www.cidrap.umn.edu/news-perspective/2007/08/study-sa...

"The researchers report that all the cities used at least one of the three main categories of NPIs, and 15 used all three at the same time. The most common combination was school closures and public gathering bans, used by 34 cities for a median of 4 weeks. All the cities except New York, Chicago, and New Haven (Conn.) closed their schools for some period of time; the median was 6 weeks."