Reconstruction is largely seen as a failure, and many historians believe this was primarily because the South for so long had been dependent on slaves that in one swift motion the South's entire livelihood shifted. This dramatic shift was too much for the Southerners to absorb at once, and harsh Jim Crow laws sprang up.
The south disagreed with helping the former slaves, so the Freedmen's Bureau promised to help poor whites as well as former slaves, so that the african americans wouldn't have a greater education than any white person.
Answer:
For us to know to not repeat it. because people blindly follow political leaders and that is how the Nazis took power.
The US drafted the Marshall Plan to help rebuild Eastern Europe countries.