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Incorrect regarding US states: https://www.nature.com/articles/s41562-020-01009-0

This paper talks about different government interventions and their effectiveness and there is no analysis of US states. There is no control group here and this is just bad science

Tell that to the to editorial board of the 33rd highest impact factor journal in the world: https://www.scimagojr.com/journalrank.php

I suggest you read more closely. There are multiple references to interventions at the state level in the US.

BTW, how would you ethically design a study like this including a control group?

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