You just about have to make a million dollars per year in the US - and be in California or NYC - to pay 50%. One million dollars in income gets you to about 47% in LA, SF, or NYC. A quarter of a million dollar income will get you up to 35% - and those are the most expensive tax locations in the country.
$50,000 (the US median full-time income) gets you a combined effective rate, before deductions, of: 16% in Dallas, 20% in LA, 23% in Portland, 16% in Seattle, 24% in NYC, and 22% in Boise.
In Seattle, Miami, or Dallas, you'll pay a combined 36% on one million dollars in income.