States: New York: Chenango
Many of the veterans of the Revolutionary War earned land grants that entitled them to free land for their service to the country. In the early 1800s land in central New York was opening up to immigration, which brought families west. I am assuming that people moving westward tended to follow friends and family members. Why they chose Chenango County over others is a good research topic! But I'm willing to bet that many of them had land grants and were simply following other family members west.
To read more about land grants, go to http://www.genealogy.com/genealogy/24_land.html?Welcome=995977553
I did a simple search on Google for "Revolutionary War land grants" and came up with a lot of great information. Good luck with your search.