When did scholars begin to question the Dunning School version of Reconstruction?

What was the main argument of plessy in plessy v. ferguson

Who proposed the corwin amendment in early march of 1861

If the imperial dynasty had continued to rule china, it is most likely that a) the economy would have improved rather than weakened b) european nations would have gotten more of a foothold in china c) revolutionary groups would not have gained any power in the country d) communism would not have received support among the poor