Which of the following events was MOST DIRECTLY related to an increase in terrorism by the Ku Klux Klan during Reconstruction? A. The Reconstruction Acts of 1867 (Radical Recontruction)

B. The surrender of Robert E Lee at Appomatox

C. The impeachment of Andrew Johnson

D. The ratification of the 13th Amendment

i believe it would influence their own way of understanding things. it shall be a foundation where they can draw or start an argument.   historians are also  scientists that  have their tools of analysis and expertise to unlock a variety of difficulties such as relationships of man, origin, politics, economy, and culture. based on facts and understanding on these areas, they may shade light to extract ideas and develop options to validate a hypothesis or debunk it.