The current president of the United Nations General Assembly (as of February 2010) is Ali Abdussalam Treki, from Libya.
President Harry Truman helped create the United Nations.
He was a United States citizen. You have to be born in the United States, in order to become president. So every U.S. president's nationality is American.
President Franklin.
Yes, the United Nations has a president who is usually voted by the representatives of UNGA.
Secretary General of the United Nations
President Andrew Jackson was an American citizen and his nationality was American. He was born in the United States and served as the seventh president of the United States from 1829 to 1837.
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Carol P Romulo was the Fourth President of the United Nations General Assembly, in 1949-50.
The founders of Samoa were of Samoan nationality. Samoa became an independent country from New Zealand in 1962 and was admitted into the United Nations in 1976.
Roosevelt
Diosdado Macapagal
Harry S. Truman