Which of the following developments after the Civil War helped protect the form of American identity that Charles Francis Adams supports in The Protection of the Ballot"? A. The passage of the Fifteenth Amendment B. The electoral success of the Radical Republicans
C. The failure of the women's suffrage movement
D. The elimination of the black codes SUBMIT

i think the answer's are a) b) and c)

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.

randy pausch was a famous mathematician, writer and lecturer who is particularly famous for his last speech, given in 2007, "the las lecture", because he illustrates why one's dreams need to be pursued in a logical order if success is to be obtained, option c. at this time, pausch had been diagnosed with terminal cancer so he told the audience to follow their childhood dreams, which were possible to achieve. it has been recognized as one of the best motivational speech around the world.