What was an unintended result of the failure of reconstruction-era policies?

After the US Civil War, the South was decimated after defeat by the Union and left in ruin. The US government began a 15 year period known as Reconstruction which set out to restructure the South after slavery, as well as to transform the economic and political environment of the South so they will not secede again.

The Reconstruction was a success in several aspects, as the South was rebuilt economically and successfully readmitted back into the Union. There were however, failures seen in Reconstruction. One of these is the racial attitudes of Southerners upon losing the right to own slaves and having to live newly freed African Americans, who were now granted more rights and freedoms especially voting. Southerners created Jim Crow laws, which slowed down civil rights of African Americans through segregation. Southerners still had immense pride in the face of defeat, and wanted to prevent African Americans from gaining new rights, whom they terrorized through the rise of the Ku Klux Klan and implemented Sharecropping. Sharecropping was system that forced black citizens to buy crops from former masters which were loaned to them at rates impossible to fully pay off.