Because the US taxes American citizens' personal income regardless of the country in which it is earned, which almost nobody else* does. https://en.wikipedia.o

Because the US taxes American citizens' personal income regardless of the country in which it is earned, which almost nobody else* does. https://en.wikipedia.org/wiki/International_taxation#Citizenship https://en.wikipedia.org/wiki/International_taxation#Citizen... * except Eritrea, although China also might want to start doing it [1] [1] http://www.nytimes.com/2015/01/08/business/international/china-starts-enforcing-tax-law-for-citizens-working-abroad.html?hp&action=click&pgtype=Homepage&module=second-column-region&region=top-news&WT.nav=top-news&_r=0 http://www.nytimes.com/2015/01/08/business/international/chi...