1. War fatigue. The Civil War had been a long and bloody conflict, and many Northerners were simply tired of war and wanted to move on.
2. Economic concerns. The war had also taken a heavy toll on the Northern economy, and many businesses and farmers were struggling to recover. Northerners were increasingly concerned about their own economic well-being, and they were less willing to support policies that they believed would benefit African Americans at their own expense.
3. Racism. Many Northerners held racist views toward African Americans, and they were unwilling to support policies that would give African Americans equal rights.
4. Political polarization. The political climate in the United States became increasingly polarized after the war, with the Republican and Democratic parties becoming more divided on a variety of issues, including Reconstruction. This made it difficult for the federal government to develop and implement a coherent Reconstruction policy.
5. Southern resistance. The Southern states resisted Reconstruction efforts, and they were often able to block or delay the implementation of federal policies. This frustrated Northerners and made them less willing to continue supporting Reconstruction.
By the end of the 1860s, support for Reconstruction had declined significantly in the North, and the federal government was no longer able to effectively enforce its Reconstruction policies. This led to the end of Reconstruction and the beginning of the Jim Crow era in the South.