This depends on the country or organization. See related questions or re-ask your question.
US: Franklin Delano Roosevelt
Franklin D. Roosevelt was the 32nd President of the United States serving from
to 1945 April 12 when he died of a brain tumor. He was the longest serving President of the United States and led the US through World War II. Roosevelt broke tradition and ran for a 3rd term in 1940, winning against Wendell Willkie. Roosevelt was born January 30, 1882 in Hyde Park, New York and died April 12, 1945 in Warm Springs, Georgia.
"Gracie Allen for President 1940"
Anastasio Somoza García was the President of Nicaragua in 1940.
The Collingwood Football Club president in 1940 was H.Curtis. He was president from 1924 to 1950.
In 1940 France was ruled by a french president.
from 1940-1945 Douglas Hyde 1945-- Séan T O'Kelly
Spain did not have a president in 1940. Generalissimo Franco was the ruler of Spain in 1940, having come to power as a result of the Spanish Civil War in 1936-1939.
There was NO South Vietnam in the 1940's.
Douglas Hyde was the Irish President from 1938-1945
President Roosevelt's running mate in the U. S. Presidential Election of 1940 was Agriculture Secretary Henry A. Wallace.
Franklin D. Roosevelt.
Frankin Delano Roosevelt
The French president in the year 1940 was Albert Lebrun.