The open prairies of the West offered the most inviting prospects for canal construction, both because of the dearth of roads and the ease of construction of artificial waterways. Not only through routes to the East, as already described, but local enterprises of various sorts abounded on every side. Chicago was connected with the Mississippi system by way of the Illinois and Michigan Canal; a route across the lower peninsula of Michigan, and many feeders in Indiana and Ohio were built. The demands upon the capital of the country for these purposes during the twenty years after 1815 were enormous; and it was only by resort to state subventions and grants from the Federal government out of the proceeds of sales of public lands, that so much was actually accomplished. State debts aggregating no less than $60,000,000 for canal construction were incurred prior to 1837. Much of this investment proved ultimately unproductive; extravagance and fraud were rife. But the economic results were immediately apparent and highly satisfactory, as witnessed in the higher prices obtainable for all the products of the interior for transportation to the seaboard. Flour, which could be had at three dollars a barrel at Cincinnati in 1826, rose to double that figure by 1835; and corn rose from twelve to thirty-two cents a bushel. The panic of 1837 and the subsequent depression, of course, put a severe check upon further canal building. But an even more potent force was the proved success of the newly invented mode of carriage by railroad. Before 1840 the era of canal construction was definitely at an end. Almost the only exception was the Erie Canal, which continued to prosper by reason of its strategic location. Rates were reduced in 1834; and two years later the canal was widened and deepened to accommodate the ever increasing traffic. Surplus revenues enabled the amortization of its debt; and by 1852 the revenue exceeded three million dollars annually. Although the pressure of railway competition was increasingly felt; as late as 1868, practically all the grain into New York was brought by canal barge. The movement of this canal tonnage, year by year, is shown by the diagram on page 25. As will be seen, it was not until the trunk line rate wars of 1874-1877 that the inferiority of the canal to the railroad, even in this favored instance, was finally demonstrated. The revival of interest in the Erie Canal which has occurred in recent years, leading to the expenditure of millions of dollars by the state of New York in still further enlarging it, is due to an effort to insure the supremacy of the port of New York in export trade against the growing competition of the Gulf ports, which it originally gained when the canal was constructed.