History Question Needed to be Answered within 3 hours with 2 references, no plagarism

Prior to the Great Depression, African-Americans were part of the Republican party. Explain what it took to less then 4% of African-American could vote to the election of the first African-American President. Please start with the transition of African-Americans from the Republican party to the Democratic party. Please explain how the Civil Rights movement started, gathered steam, and force changes to elect the first African-American President. Don't answer the questions individually. Give me a narrative from the Great Depression until the election of President Obama due to the Civil Rights movement that allowed this to happen.

Need this answered today within 4 hours with 2 references.