Since the crisis of 2008 the USA has had several trillion dollars in stimulus spending. Very roughly speaking, Europe pursued policies of austerity, whereas the USA followed a more Keynesian route of big spending. On this matter, the Keynesians have been vindicated. In 2007 the GDP of the EU was slightly larger than the USA, but now it has fallen far behind: $16 trillion ($18 trillion if it still had the UK) versus $25 trillion for the USA. And the most important policy difference since 2008 has been large stimulus spending in the USA, versus relative austerity in Europe. More recently, President Biden was able to push through some big infrastructure bills, which should power the USA through the 2020s. (There are some qualifiers to be added about weaknesses in the USA system of funding and allowing construction, in particular the aggressive system of "substantive due process" that allows for any project to be stalled by lawsuits, but despite that, the USA has done better than Europe.)