You have to take into account that Europe is much more densely and uniformly populated than the United States, and had outbreaks start earlier than the US.
WRT. "United States of Europe", thanks to the EU, you can often consider the Union as a unit in terms of trade; Europe is also more homogenous culturarly than the states. However, when talking about COVID-19, EU has almost zero influence on how the pandemic is handled (somewhat by design, definitely by vote); it's only meaningful to talk about individual nations, with their own healthcare systems, their own emergency policies, and their own sovereign, locked down borders.
> You have to take into account that Europe is much more densely and uniformly populated than the United States, and had outbreaks start earlier than the US.
Now take into account that these countries have supposedly superior healthcare systems, a healthier population, and leaders not named Trump. I’d say that negates those factors.
WRT. "United States of Europe", thanks to the EU, you can often consider the Union as a unit in terms of trade; Europe is also more homogenous culturarly than the states. However, when talking about COVID-19, EU has almost zero influence on how the pandemic is handled (somewhat by design, definitely by vote); it's only meaningful to talk about individual nations, with their own healthcare systems, their own emergency policies, and their own sovereign, locked down borders.