Answer:
There were four in total during the Great Depression
Explanation:
Charles Curtis - Herbert Hoover's VP
John Nance Garner - FDR's VP from 1933 - 1941
Henry A Wallace - FDR's VP from 1941 - 1945
Herbert Hoover - FDR's VP in 1945
Although, you must keep in mind that the country was considerably out of the depression by America's entrance into WW2, but there was a fear that after the war ended the depression would return. It definitely looked that way until Herbert Hoover implemented price controls, etc.