Can somebody do this for me I've been working all day.

answer; i believe the correct answer is (the willamete valley);

the answer would more than likely a.)falling crop prices  

hope the answer is right and ,either way have a nice day.

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.

thats allot of questions