@Frank Apisa,
I believe the right answer here is that the motives of the founders and the members of the Constitutional Convention (all appointed by the states as their representatives) were a good deal more varied than Frank acknowledges. A central motivation of the great majority at the convention was indeed to avoid concentrating excessive power in ANY single organ of the new Federal Government they were creating. The bicameral legislature they created was a fairly obvious derivative of the existing British system with a House of Lords and a parliament. The states were generally insistent on a component of the new legislature that represented themselves primarily, and the compromise that resulted provided for a Senate with two representatives from each state, appointed as the States themselves saw fit.
The persistent focus on a separation of powers and various checks and balances between the Executive, Judiciary and Legislative functions, and between the two legislative houses is very evident in the historical record. The central motivation was clearly to avoid a too great concentration of power in any one of them. The specific concerns behind that varied from member to member and two schools of thought and political action emerged from it - one led by Jefferson and the other by Hamilton. These concerns varied among the individuals involved, and they ranged from a desire for more reflection and caution in the exercise of power to a fear of tyranny at the hands of one element, be it the legislature, the executive or the judiciary.
A comparison of the results of the American and French Revolutions and of the basic laws & strucrtures they created, very strongly suggests that our founders made some very wise choices in these areas. A Frenchman, Alexis de Toquevile, described all of this very well in the late 1830s in his work, "Democracy in America". By then, of course, the flaws in the structure that emerged from the French Revolution had already become very apparent.
Our system isn't perfect, but it has done very well compared to its real alternatives. Who knows, Frank may even see fit to preserve some of it in the revolution he sees coming.