The assent and co-operation of Maryland being indispensable to the improvement of the Potomac, he was equally earnest in his endeavours to impress a conviction of its superior advantages on those individuals who possessed most influence in that state. In doing so, he detailed the measures which would unquestionably be adopted by New York and Pennsylvania, for acquiring the monopoly of the western commerce, and the difficulty which would be found in diverting it from the channel it had once taken. "I am not," he added, "for discouraging the exertions of any state to draw the commerce of the western country to its sea-ports. The more communications we open to it, the closer we bind that rising world (for indeed it may be so called) to our interests, and the greater strength shall we acquire by it. Those to whom nature affords the best communication, will, if they are wise, enjoy the greatest share of the trade. All I would be understood to mean, therefore, is, that the gifts of Providence may not be neglected." But the light in which this subject would be viewed with most interest, and which gave to it most importance, was its political influence on the union. "I need not remark to you, sir," said he in his letter to the governor of Virginia, "that the flanks and rear of the United States are possessed by other powers,--and formidable ones too: need I press the necessity of applying the cement of interest to bind all parts of the union together by indissoluble bonds,--especially of binding that part of it which lies immediately west of us, to the middle states. For what ties, let me ask, should we have upon those people, how entirely unconnected with them shall we be, and what troubles may we not apprehend, if the Spaniards on their right, and Great Britain on their left, instead of throwing impediments in their way as they now do, should hold out lures for their trade and alliance? when they get strength, which will be sooner than most people conceive, what will be the consequence of their having formed close commercial connexions with both, or either of those powers? it needs not, in my opinion, the gift of prophecy to foretell." This idea was enlarged and pressed with much earnestness, in his letters to several members of congress.