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Henry A Wallace, former Vice President of the United States, waving as he boards a Pan Am airplane bound for London, circa 1950. (Photo by Keystone/Hulton Archive/Getty Images)

Henry A Wallace, former Vice President of the United States, waving as he boards a Pan Am airplane bound for London, circa 1950. (Photo by Keystone/Hulton Archive/Getty Images)

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Henry A Wallace (1888-1965), Vice President of the USA under Roosevelt's third term (1941 - 1944) photographed at the Savoy Hotel, London in 1947. (Photo by Popperfoto via Getty Images/Getty Images)

Henry A Wallace (1888-1965), Vice President of the USA under Roosevelt's third term (1941 - 1944) photographed at the Savoy Hotel, London in 1947. (Photo by Popperfoto via Getty Images/Getty Images)

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US Vice President Henry A Wallace (1888 - 1965) with Margaret Connors, circa 1945. (Photo by FPG/Archive Photos/Getty Images)

US Vice President Henry A Wallace (1888 - 1965) with Margaret Connors, circa 1945. (Photo by FPG/Archive Photos/Getty Images)

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Newly-reelected American President Franklin Delano Roosevelt (1882 - 1945) (center) rides with his outgoing Vice President Henry A. Wallace (1888 - 1965) (right) and incoming VP Harry S. Truman (1884 - 1972) (left) as they return to Washington after the 1944 election victory, November 10, 1944. (Photo by Abbie Rowe/PhotoQuest/Getty Images)

Newly-reelected American President Franklin Delano Roosevelt (1882 - 1945) (center) rides with his outgoing Vice President Henry A. Wallace (1888 - 1965) (right) and incoming VP Harry S. Truman (1884 - 1972) (left) as they return to Washington after the 1944 election victory, November 10, 1944. (Photo by Abbie Rowe/PhotoQuest/Getty Images)

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Henry Agard Wallace (1888 - 1965) the American agriculturalist and statesman. Wallace ran for the presidency in 1948 as the candidate of the Progressive Party. Original Publication: People Disc - HM0222 (Photo by Hulton Archive/Getty Images)

Henry Agard  Wallace (1888 - 1965)  the American agriculturalist and  statesman. Wallace ran for the presidency in 1948 as the candidate of the Progressive Party.  Original Publication: People Disc - HM0222   (Photo by Hulton Archive/Getty Images)