"As of now, my working thesis is: Examining the reasons for and benefits of an increase in tractor drawbar pull weight from the introduction of tractors until 1980."
You might consider changing part of your title from "tractor drawbar pull weight" to "tractor drawbar pull force". Both weight and force can be expressed in pounds, but as you take more engineering classes you will see that they are very different things.
As others have already said, some of the major innovations were: rubber tires; weight transfer systems (3 point hitch, snap coupler, fast hitch, eagle hitch, etc.); and front wheel drive/four wheel drive articulated tractors/tracks.
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Today's Featured Article - Talk of the Town: How to Crank Start a Tractor - by Staff. This interestin discussion is from the Tractor Talk Discussion Forum. Remember that safety is your first priority - make sure you know what you are doing before attempting a potentially dangerous activity!
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