Why specifically did Andrew Johnson's Reconstruction plan fail?

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Johnson's Reconstruction plan failed because many ex-Confederates and pre-Civil War elite came into power in the South, which resulted in the passage of restrictive black codes and limited opportunities for freed slaves. Johnson's leniency toward former Confederates also alienated congressional Republicans, leading to a power struggle that ultimately led to the impeachment trial against him. The South remained poor and black southerners were still denied equal rights, but it was the political power shift that ultimately undermined Johnson's Reconstruction plan.

Why Specifically Did Andrew Johnson's Reconstruction Plan Fail