China, People's Republic of; and India are the greatest nations on the Earth in terms of population: at well over a billion, they are each four times the population of the United States and twice that of Europe. They are currently rapidly rising in developmental status, and with time (supposedly in two or three decades) will surpass the United States in output (GNP or GDP). Justification:China has a growth rate considerably higher than that of the United States at present. Justification:Indeed, the United States already owes China a tremendous trade deficit on the order of trillions of USD.