Here is a list of the richest countries

Luxembourg (GDP per capita: $119,719)

Norway (GDP per capita: $86,362)

Switzerland (GDP per capita: $83,832)

Ireland (GDP per capita: $81,477)

Iceland (GDP per capita: $78,181)

Qatar (GDP per capita: $65,062)

The United States of America (GDP per capita: $64,906)

Denmark (GDP per capita: $63,434)

Singapore (GDP per capita: $62,690)

Australia (GDP per capita: $58,824)

so I know the USA is the richest country but this is the richest countries by GDP.

The GDP Per Capita of Mali is $1,100 according to 2009 estimates by the CIA.

You should use GDP per capita when comparing countries GDPs

The GDP per capita is used to measure a country's standard of living. It is calculated by dividing the country's GDP by its population, which better allows comparison of GDP between countries.

The per capita GDP of Haiti is $1,317.