In what year did Ida Mae successfully vote for the first time as noted in the nonfiction book, The Warmth of Other Suns?

In November 1940, FDR was in a tight re-election against his opponent Wendell Wilkie. World War II was raging and the Depression still had its impact. Ida Mae and other blacks on Chicago’s South Side were being tutored by activists on voting. This was new for Ida Mae; no one in her world talked about elections and voting in Mississippi. Her governor, Theodore Bilbo, was an admitted Klansman. His speeches were openly biased toward his white constituents. Like most black migrants from the South, Ida Mae had known nothing about the politics or politicians back home. Illinois was crucial to Roosevelt’s reelection and to the Democratic Party. They were recruiting the votes of the black community including the new migrants because they were relying on them. It was all new to her but Ida Mae successfully voted for the first time in her life.