Geographic factors starting in the colonial period led to differences between theregions including abundant new resources in the such as cheapland and mineral deposits, fertile land for cash crops in the andsafe harbors and fast-flowing rivers in the .

your answer will most likely be a.

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.