How did the new deal cause african americans to change the party alliance?

Ineed to have answers for numbers 2-4 reply to this question

How does a comet change when it comes close to the sun

Which of the following is a likely reason that someone today might decide to move from a city in the midwest to the south? a. the decline of manufacturing in the midwest b. the many high tech jobs available in the south c. urban overcrowding in the midwest d. higher housing costs in the south