Why does a historian have to understand what a point of view is?

A point of view is important because it shows who is telling the story of what happened and thus clues them in to whether the story teller may be biased, not know everything that happened, or simply perceive what happened in a different way than what may have happened.

lincoln won 212 electoral votes to mcclellan's 21 votes, and lincoln beat mcclellan. is the main reason lincoln won in 1864.

the soviet union wanted to impose communist governments in eastern europe.