NEED HELP ASAP Use the chart below to answer the questions:

US - Population: 272,648,000
US - Area (Square km) : 9,364,520
Romania - Population: 22,609,000
Romania - Area(Square km) : 237,391
Ghana - Population: 18,339,000
Ghana - Area(Square km) : 237,533

Which of these countries has the greatest population density? Which has the least? Provide an explanation and proof for your answer to receive full credit.