Answer:
One major success
One major success of the South after the Civil War was the modernization of the region.
The South underwent a major transformation in terms of infrastructure, industry, and technology.
New railroads, factories, and telegraph lines were built while new businesses and industries flourished, bringing much-needed economic growth.
One major problem
One major problem that the South faced after the Civil War was the issue of racial inequality.
Despite the 13th Amendment, which abolished slavery, African Americans were still denied basic civil rights and were subjected to racial discrimination, segregation, and violence.
This created a major obstacle to the South's recovery and hindered its progress in the decades after the war.