Historiography is the study of the methods and individuals who have written or developed history as an academic field. Essentially the history of how our historical knowledge was constructed or written.
If your teacher selects you to speak on behalf of your class to the principal you are a "representative" of your class, in the sense that you are bringing the opinions of the whole class with you.
Answer:
In 1865 President Andrew Johnson implemented a plan of Reconstruction that gave the white South a free hand in regulating the transition from slavery to freedom and offered no role to blacks in the politics of the South. The conduct of the governments he established turned many Northerners against the president's policies.