The U.S. collected 10% of its GDP in taxes in 2020 [1]; France and Italy did about 25%, Germany 11.5%. (Switzerland and "communist" China clock in below 10%.)
There is sufficient variation in tax policy across the EU, let alone Europe, to make broad-based comparisons meaningless.
[1] https://data.worldbank.org/indicator/GC.TAX.TOTL.GD.ZS?most_... a more-expansive definition from the Fed raises this to 16% [a]
Overall it's 38%: https://www.oecd.org/tax/revenue-statistics-germany.pdf
For the US you're missing some taxes, too because the overall is somewhere near 30%, 10 percentage points lower than Germany. I think your US link does not include state and local taxes etc
This is incorrect (despite the citation).
Federal tax collection in 2020 was about 16% of GDP
https://fred.stlouisfed.org/series/FYFRGDA188S
The OECD reports "The tax-to-GDP ratio in the United States has decreased from 28.3% in 2000 to 24.5% in 2019."
https://www.oecd.org/tax/revenue-statistics-united-states.pd...
For comparison, the weighted average in other OECD countries is about 34%.
Donating my income is besides the point, as it's the top income brackets that really need to be taxed. I would and do happily vote for higher taxes on myself when the option is available.