Since the 1960s, revenue from total taxation as a percent of gdp is unchanged. Not also the difference in tax revenue between Europe and America stems mostly from policies that tax the middle class not the "rich":
https://manhattan.institute/article/a-comprehensive-federal-...
The U.S. already taxes the rich—measured by both tax rates and tax revenues—at levels roughly equal to the OECD average. Yes, the other 38 OECD nations collect tax revenues that, on average, exceed the U.S. by 7.5% of GDP (at all levels of government). However, nearly this entire difference results from the other 38 OECD nations hitting their middle class with value-added taxes (VATs) that raise an average of 7.2% of GDP. And while the progressive avatars of Finland, Norway, and Sweden exceed U.S. tax revenues by 16% of GDP, that gap virtually disappears after accounting for the 14.5% of GDP in higher payroll and VAT revenues that broadly hit the Nordic middle class. Europe finances its progressive spending levels on the backs of the middle class, not the wealthy.[37]
This plan should be a must read for people from any spot along the American political spectrum.