The capital gains rate in the UK is 20%.
https://www.gov.uk/capital-gains-tax/rates
The top capital gains rate in the US is 23.8% + state taxes.
That being said, I'm taking about effective (i.e. Actual tax liabilities) and you are all focusing on theoretical liabilities without understanding that the tax bases are different.
It's honestly not worth the effort to keep correcting all the GUD in this thread.
A tax on, among other things, capital gains. See:
https://www.irs.gov/newsroom/questions-and-answers-on-the-ne...
"8. What is included in Net Investment Income?
In general, investment income includes, but is not limited to: interest, dividends, capital gains..."