The United States is a capitalist country. The richest people in the USA have, on average, a far greater share of the total income or wealth than the poorest people. Compared to other developed countries, the USA is very unequal.
Economic inequality can be measured in terms of:
The Gini coefficient is a measure of wealth or income inequality within a country, where 0 represents complete equality and 1 complete inequality. According to the UN, the USA is 0.45 and rising. The UK is at 0.34.
(statistics US Government)
There is debate in the USA on where the poverty line should be drawn. It is generally accepted that poverty rates in the US are higher than elsewhere in the developed world.