Shays rebellion was an uprising of indebted farmers against their creditors. This greatly alarmed the American political class. Numerous historians have written about the direct connection between this event and the calling forth of the convention.
Leonard Richards, Shays Rebellion, the America Revolution's Final Battle (this book makes the best case)
Andrew McLaughlin, the Confederation and the Constitution, p 166.
Charles & Mary Beard, The Rise of American Civilization, p 307-308.
A Little Rebellion, Marion Lena Starkey
Democratic Eloquence: The Fight over Popular Speech in the 19th century (discusses elite attitudes towards the ascendancy of the common man in the period before the Constitutional Convention).
Boston merchant Stanley Higginson told Henry Knox, who drafted a proposal that reflected much of what later became the constitution, "You will no doubt endeavor to draw strong arguments from the insurrection in the state in favor of an efficient general government of the union."
And as Charles Beard examined the class division between those who favored the Constitution and those who did not, he found that " all of the merchants, money lenders, security holders, manufacturers, shippers, capitalists, and financiers and their professional associates are to be found on one side in support of the Constitution and that substantially all or the major portion of the opposition came from the non-slaveholding farmers and the debtors."
He goes on to say that "The movement for the Constitution of the United states was originated and carried through principally by four groups of personalty interests which had been adversely affected under the Articles of Confederation: money, public securities, manufactures, and trade and shipping:
The first firm steps toward the formation of the Constitution were taken by a small and active group of men immediately interested through their personal possessions in the outcome of their labors.
No popular vote was taken directly or indirectly on the proposition to call the Convention which drafted the Constitution.
A large propertyless mass was, under the prevailing suffrage qualifications, excluded at the outset from participation (through representatives) in the work of framing the Constitution.
The members of the Philadelphia Convention which drafted the Constitution were, with a few exceptions, immediately, directly, and personally interested in, and derived economic advantages from, the establishment of the new system.
The Constitution was essentially an economic document based upon as recognizing the claim of property to a special and defensive position in the Constitution.
In the ratification of the Constitution, about three-fourths of the adult males failed to vote on the question, having abstained from the elections at which delegates to the state conventions were chosen, either on account of their indifference or their disfranchisement by property qualifications."
Charles Beard, An Economic Interpretation of the Constitution of the United States (1913).