French vessels; and they stated that the only reason why the French did not absorb the whole trade, was that they had not a sufficient number of vessels to undertake it. The petitioners further insisted that nothing but “a positive tonnage duty,” graduated according to the amount of the differential duties levied in France on the chief American staples, would avail to keep their trade in their own hands. [Sidenote: Rapid rise of New Orleans] Nevertheless, in spite of these hostile tariffs, and the war of retaliating duties which was for some time waged, New Orleans, from being the natural emporium of the vast tracts of country traversed by the Mississippi, Missouri, and their tributary streams, and enjoying, as it does, a greater command of internal navigation than any other city in either the Old or New World, has made since 1820 the most astounding strides in its maritime commerce.[5] [Sidenote: and of New York.] But in the face of equal difficulties as regards hostile tariffs, New York, through the great natural resources at her command, and other causes, surpassed New Orleans in the rapidity of its early commercial and maritime progress. Although its advancement during the first decade of the present century was scarcely equal to that of the preceding ten years, during which it enjoyed unexceptionable prosperity (no other city in the United States having profited so much, during the earlier periods, by the war in Europe), its merchants and shipowners suffered severely between 1806 and 1815 from the disastrous effects of captures, condemnations, and embargoes. Nor was it until 1825 that New York began to assume the importance which she has continued to maintain among the other commercial cities of the Union. In that year an internal element of prosperity was brought into operation by the construction of the Erie Canal, which opened for trade the agricultural products of the fertile valley of the Tennessee, and the whole coasts of the northern lakes. The introduction of steam-navigation, to which I shall fully refer hereafter, affording greatly increased facilities for the conveyance of merchandise to and from New York by means of the numerous navigable rivers which intersected that and the neighbouring States, naturally gave an enormous impulse to its navigation, while the coal from the great Pennsylvania coal basin contributed essentially to its prosperity.[6] [Sidenote: Boston ships extend their trade to India and China.]