By making the democratic party, party of racial equality, FDR cause African Americans to change party allegiance.
Step-by-step explanation:
During the Democratic elections Franklin D. Roosevelt won the presidential elections and worked toward the great depression.
He also make policies for the betterment of the African American and granted new rights to them and also focused on their employment and poverty issues.
But also in those years, Democratic party was the biggest opponent of the Advancement of the civil rights of the Blacks.