Little wonder that the volume of traffic immensely increased, and that, moreover, the balance of power among western centres was at once affected. The future of Chicago, as against St. Louis, was insured; and the long needed outlet to the sea was provided for the agricultural products of the prairie West. The instant and phenomenal success of the Erie Canal immediately encouraged the prosecution of similar enterprises elsewhere. Philadelphia pushed the construction of a complicated chain of horse railroads, canals and portages in order to reach the Ohio at Pittsburg. In 1834 an entire boat and cargo made the transit successfully. The cost of this enterprise exceeded $10,000,000; but it was expected to provide a successful competitor for the Erie Canal. The latter in the meantime had been linked up with the Ohio river by canals from Cleveland to Portsmouth, from Toledo to Cincinnati, and from Beaver on the Ohio, to Erie on the Lake. By the first of these routes in 1835, no less than 86,000 barrels of flour, 28,000 bushels of wheat and 2,500,000 staves were carried by canal on to New York. Boston and Baltimore were prevented from engaging in similar canal enterprises only by the advent of the railway. Meantime the Chesapeake and Ohio Canal was started in 1828 as a joint undertaking of Maryland, Virginia, and the Federal government, to connect the Potomac with the Ohio. It was not completed in fact until 1850, long after its potential usefulness had ceased. Besides these through routes, canals for the accommodation of local needs were rapidly built in the East. Boston was connected with Lowell; Worcester with Providence; New Haven with the Connecticut river. In Pennsylvania, especially, the anthracite coal industry, developing after 1815, encouraged the building of artificial waterways. The Delaware and Hudson, the Schuylkill, Morris and Lehigh canals were built between 1818 and 1825 along the natural waterways leading out from the hard coal fields. New Jersey connected New York and Philadelphia by the Raritan Canal in 1834-1838 at a cost of nearly $5,000,000; and another canal to connect Delaware and Chesapeake bays was with difficulty, and only by the aid of the Federal government, finally completed about 1825 at a cost of nearly $4,000,000. Further south, many small canals and river improvements were made. The Dismal Swamp enterprise had already connected Chesapeake Bay and the coast waters and sounds of the Carolinas; but provision for slack water navigation of the Tennessee river at Mussel Shoals in Alabama, and of the various branches of the Ohio river in Kentucky was not made until the middle of the thirties.