Why did the U$.$S$.$ South switch from a Democrat stronghold to a Republican region?

Group of answer choices

Republican leaders proposed tax cuts that disproportionately benefitted the South

Southern voters $($Black and white$)$ were upset with the government imposing harsh regulation on their businesses

When Black voters regained the right to vote, they voted Republican because it is the party of Abraham Lincoln

The Democratic leadership embraced the Civil Rights movement, alienating a lot of Southern white voters.