Prosperity.
Calvin Coolidge was in office as president from 1923 to the spring of 1929. In that period of the "Roaring Twenties," the country experienced great economic success -- in between the brief depression that followed World War I and the Great Depression that began with the stock market crash that occurred in the fall of 1929.
to protect and enhance the rights of African Americans
The 13th Amendment ended slavery in the US. The 14th Amendment gave blacks citizenship and established due process. The 15th Amendment gave black men the right to vote.
These three amendments were passed toward the end and following the Civil War. They ended the practice of slavery releasing blacks throughout the South from enslavement. The 14th and 15th Amendments provided rights and Constitutional protect for blacks in addition to giving them the power to vote. However, Southern governments found ways around the amendments to prevent blacks from exercising their full rights.
C. Chief Justice Taney was son of a slave holding family
The main reason was that so they get to have the land.