Food surpluses made the society over estimate how much food was readily available, so often times they were followed by a famine.
Shay's Rebellion showed the weaknesses of the Articles of Confederation. When the central government couldn't put down the rebellion, the first stirrings of federalism began to gather strength. ... The government gave most powers to the states, and the central government consisted only of a legislature.
I believe it was "overpopulation."
It prevented colonists from moving west of the appalachian mountains.
