It was evident from the first that the combination was more than England could hope to meet. Lord North at once gave way. He offered to satisfy the American demands, and he asked that Chatham should take office. From the moment that his old enemy, France, appeared on the scene, Chatham was passionately warlike. The king agreed that he should be asked to join the ministry, but refused to see him. America declined the English overtures, in fulfilment of her treaty with France. The negotiation with Chatham became impossible. That was no misfortune, for he died a few weeks later, denouncing the government and the opposition. Then came that phase of war during which the navy of France, under d'Orvilliers in the Channel, under Suffren in the east, under d'Estaing and de Grasse in the west, proved itself equal to the navy of England. It was by the fleet, not by the land forces, that American independence was gained. But it was by the army officers that American ideas, sufficient to subvert every European state, were transplanted into France. When de Grasse drove the English fleet away from Virginian waters, Cornwallis surrendered the army of the south at Yorktown, as Burgoyne had surrendered with the northern army at Saratoga. The Whigs came in and recognised the independence of the colonies, as North would have done four years earlier, when France intervened. Terms of peace with European Powers were made more favourable by the final success of Rodney at Dominica and of Elliot at Gibraltar; but the warlike repute of England fell lower than at any time since the Revolution. The Americans proceeded to give themselves a Constitution which should hold them together more effectively than the Congress which carried them through the war, and they held a Convention for the purpose at Philadelphia during the summer of 1787. The difficulty was to find terms of union between the three great states--Virginia, Pennsylvania, Massachusetts--and the smaller ones, which included New York. The great states would not allow equal power to the others; the small ones would not allow themselves to be swamped by mere numbers. Therefore one chamber was given to population, and the other, the Senate, to the states on equal terms. Every citizen was made subject to the federal government as well as to that of his own state. The powers of the states were limited. The powers of the federal government were actually enumerated, and thus the states and the union were a check on each other. That principle of division was the most efficacious restraint on democracy that has been devised; for the temper of the Constitutional Convention was as conservative as the Declaration of Independence was revolutionary.