Pittsburg in 1821, was carrying on a considerable trade with Philadelphia, Baltimore, and New Orleans, and likewise some little with New York, by way of the Hudson and Mohawk Rivers, and the lakes.[536] The price of carriage from Philadelphia and Baltimore had now been reduced to $4 to $6 for one hundred weight.[537] Flint writing a few years later, says, "But the wealth, business, and glory of this place are fast passing away, transferred to Cincinnati, to Louisville, and other places on the Ohio. Various causes have concurred to this result, but especially the multiplication of steamboats, and the consequent facility of communication with the Atlantic ports by the Mississippi. There is little prospect of the reverse of this order of things. The National Road, terminating at Wheeling, contributes to this decay of Pittsburg. Her decline is not much regretted, for she used to fatten on the spoils of the poor emigrants that swarmed to this place."[538] The trade of Pittsburg may have been on the decline, but scarcely so bad as Flint paints it. One traveler, on the road between Baltimore and Frederick, on March 3, 1827, passed 235 wagons in a distance of 35 miles.[539] Another element contributing largely to the growth and prosperity of Pittsburg was her manufacturing establishments. In 1810 the manufactures of this city amounted to $1,000,000, and in 1814 it was estimated that their value would be doubled.[540] The 'Register' of April 9, 1825 says that Pittsburg is "the greatest manufacturing town in the United States."[541] The articles manufactured at Pittsburg were sent to the western country, New Orleans, and the West Indies.* During this period the population of Pittsburg increased from 4740 inhabitants in 1810[542] to 22,433 in the city and its suburbs in 1830.[543]