Hindsight · review build · data not yet validated
The United States continues to be the economic leader due to its primacy in popular culture and its entrepreneurial environment.
Grader A: hit
The US stayed the largest economy in the world in 2009-2010, at more than twice the size of number two. The stated causes (popular culture, entrepreneurship) cannot be tested, but the core claim holds.
Test: Rank test: US nominal GDP rank 1 in 2010 (about $15.0 trillion vs China $6.1 trillion).
Grader B: hit
The US stayed the world's largest economy through 2009 and after. In 2009 US GDP was $14.48 trillion, versus $5.34 trillion for Japan and $5.19 trillion for China. The 'due to' causal clause cannot be tested. The leadership claim holds.
Test: Not an adoption claim. Test: largest national economy by GDP in 2009. US: $14.48T. Next: Japan $5.34T, China $5.19T (World Bank, current US$).