Thomas Jefferson was at this time forty-seven years old, and owing both to seniority and to the distinguished positions he had held, he ranked as the most illustrious member of the Administration. His correspondence at this period shows that he was fully aware of the importance of the crisis, and he did not overrate it when he wrote to James Monroe, June 20, 1790, that, unless the measures of the Administration were successful, "our credit will burst and vanish, and the States separate to take care everyone of itself." In this letter Jefferson outlined the compromise that was actually adopted by Congress. The strongest opposition to the assumption bill had come from Virginia, although Maryland, Georgia, and New Hampshire also opposed it, and the Middle States were divided. Jefferson was able to get enough Southern votes to carry assumption in return for enough votes from Hamilton's adherents to carry the Potomac site. An agreement was reached at a dinner given by Jefferson to which he invited Hamilton and Madison. According to this arrangement, the capital was to remain in Philadelphia for ten years and after that to be on the Potomac River in a district ten miles square to be selected by the President. The residence act was approved July 16, 1790; the funding and assumption measures, now combined in one bill, became law on August 4.
After Jefferson turned against the Administration, his participation in the passage of the assumption bill was such an awkward circumstance that he discredited his own intelligence by professing that he "was most ignorantly and innocently made to hold the candle" to Hamilton's "game." In reality the public service Jefferson then performed was the most useful in all his long and fruitful career. But for this action, the Declaration of Independence, to the drafting of which he owes his greatest fame, might now be figuring among the historical documents of lost causes, like similar elaborate statements of principle made during the Commonwealth period in England. Had the national forces failed at the critical period of financial organization, and the States, bankrupt by the revolutionary struggle, been left in the lurch, the republic would have followed the usual course of disintegration displayed by federations from the time of the Greek amphictyonies down to that of the Holy Roman Empire.