One of the great things about America is that it has 50 states that can set their own policy across a broad range of areas, including on public health and lockdowns. This has allowed some to resist the stampede to impose swingeing restrictions on normal life in the hope of limiting transmission of SARS-CoV-2, and this provides us with a valuable control group in the great lockdown experiment that can give us an idea what might have happened if we hadn't made some intervention or other.
During the autumn and winter a new surge in Covid infections prompted most US states, like most Western countries, to reimpose restrictions. But a few resisted. Eleven states did not impose a stay-at-home order and left people at liberty to leave their homes whenever they wished. Of these, four – Florida, Georgia, South Carolina and South Dakota – did not impose any restrictions at all and treated it pretty much like any other winter.