The figures above where scaled to population, the actual US population (according to the wiki source) was 2,121,600 vs. UK with 83,014 - the GDP is honestly pretty even per capita though the US probably suffers from worse wealth inequality[1] although the CIA factbook says that both countries have ~15% population below the poverty line - so many that's not really a factor.

1. https://www.cia.gov/library/publications/the-world-factbook/...