<Tr> <Td> GDP (PPP) </Td> <Td> $974.406 billion ($12,478 per capita) </Td> <Td> $16.768 Trillion ($53,001 per capita) </Td> </Tr> <Tr> <Td> Military expenditures </Td> <Td> $14.7 billion </Td> <Td> $593 billion </Td> </Tr> <P> The Treaty of Commerce and Navigations (signed in 1856) was the first diplomatic interaction the United States and Persia had and lasted until 1928 . The U.S. had little interest in Persian affairs, while U.S. as a trustworthy outsider did not suffer . The Persians again sought the U.S. for help in straightening out its finances after World War I . This mission unlike the last was opposed by powerful vested interests and eventually it was withdrawn with its task uncompleted . Following this there was no special U.S. concern with Iran or any interaction until World War II . </P> <P> Political relations between Persia and the United States began when the Shah of Persia, Nassereddin Shah Qajar, officially dispatched Persia's first ambassador, Mirza Abolhasan Shirazi, to Washington D.C. in 1856 ." In 1883, Samuel G.W. Benjamin was appointed by the United States as the first official diplomatic envoy to Iran, however; Ambassadorial relations were not established until 1944 . </P>

The united states's major allies in world war ii were