Final answer:
Southerners reacted negatively to Radical Reconstruction due to the changes imposed upon them, perceived threats to traditional social and economic foundations, and resentment towards corruption.
Step-by-step explanation:
Southerners reacted negatively to Radical Reconstruction for several reasons. Many white southerners were outraged at the changes being imposed upon them, especially the sight of formerly enslaved Black people in positions of authority. They viewed this as a threat to the traditional social and economic foundations of the South. Additionally, they believed that the Reconstruction era was characterized by corruption and exploitation, with northerners and freed people seeking to enrich themselves at the expense of the South. The resentment and opposition to these changes ultimately led to the collapse of Radical Reconstruction.