The two great thoroughfares of American commerce in the first half of the nineteenth century were the Cumberland Road and the Erie Canal. The first generation of the new century witnessed the great burst of population into the West which at once gave Ohio, Indiana, Illinois, Michigan, and Wisconsin a place of national importance which they have never relinquished. So far as pathways of commerce contributed to the creation of this veritable new republic in the Middle West, the Cumberland Road and the Erie Canal, coöperating respectively with Ohio River and Lake Erie steamboats, were of the utmost importance. The national spirit, said to have arisen from the second war with England, had its clearest manifestation in the throwing of a great macadamized roadway across the Alleghanies to the Ohio River and the digging of the Erie Canal through the swamps and wildernesses of New York. Both of these pathways were essentially the fruition of the doctrine to which Washington gave wide circulation in his letter to Harrison in 1784, wherein he pictured the vision of a vast Republic united by commercial chains. Both were essentially Western enterprises. The highway was built to fulfil the promise which the Government had made in 1802 to use a portion of the money accruing from the sale of public lands in Ohio in order to connect that young State with Atlantic waters. It was proposed to build the canal, according to one early plan, with funds to be obtained by the sale of land in Michigan. So firmly did the promoters believe in the national importance of this project that subscriptions, according to another plan, were to be solicited as far afield as Vermont in the North and Kentucky in the Southwest. All that Washington had hoped for, and all that Aaron Burr is supposed to have been hopeless of, were epitomized in these great works of internal improvement. They bespoke coöperation of the highest existing types of loyalty, optimism, financial skill, and engineering ability.