What was the federal governments major challenges to reconstructing the South after the Civil War?

The federal government faced significant challenges in reconstructing the South after the Civil War, primarily due to widespread social and economic devastation. There was intense resistance from Southern whites who opposed the changes brought by Reconstruction, leading to violence and the rise of groups like the Ku Klux Klan. Additionally, integrating newly freed African Americans into society and ensuring their civil rights posed a substantial challenge, complicated by the lack of infrastructure and resources in the war-torn South. Political divisions in Congress further hindered the establishment of effective Reconstruction policies.