Answer:
The realignment of African Americans from the Republican Party to the Democratic Party began in the early 20th century during the Great Migration. African Americans, who had been freed from slavery and the subsequent years of segregation, sought political representation and economic opportunities that were not available in the South. The Republican Party, at the time, had become the party of Lincoln and was seen as the party of emancipation, racial equality, and civil rights.
The Democratic Party, however, was also attractive to African Americans because of the New Deal. The New Deal, a series of economic reforms under the Franklin Delano Roosevelt administration, provided much-needed economic relief to those affected by the Great Depression. The New Deal also provided financial assistance to African Americans, and was seen as a way to promote economic equality and opportunity.
The realignment of African Americans to the Democratic Party was further cemented by the Civil Rights Movement of the 1950s and 1960s. The Democratic Party supported civil rights legislation, while the Republican Party resisted. This further solidified African Americans’ loyalty to the Democratic Party, and by the late 1960s, the majority of African Americans had become staunch Democrats.