re: If you were randomly sent to the past, would you be able to make a historic difference?

Assuming no prep time, my only ability would be to try and find the people who invented things and bet on them in the stock market or try and work for future influential people. But if you are talking about going back into the early 1900s, I'm not certain if make a whole helluva lot of difference. I just don't have that much knowledge of important people during that time period.