Actually, among developed countries the US has a relatively high corruption level, I believe. (Insert many caveats about how difficult corruption is to measure.)
They rate USA 3/4 for corruption (Section C2 [0])
Comparing other similar nations for corruption
Australia 4/4 Canada 4/4 New Zealand 4/4 United Kingdom 4/4
[0] https://freedomhouse.org/country/united-states/freedom-world...
Compare vs. China https://freedomhouse.org/country/china/freedom-world/2020