Means of cheap transportation, the lack of which had been so great an obstacle to internal development, had been or were being supplied to meet the requirements of the new conditions. The steamboat arrivals at New Orleans numbered a thousand each year. Water communication between the Atlantic Ocean and the very center of the United States was established when the Erie Canal connected the Hudson River to the waterway afforded by the series of great inland seas. There were 1,343 miles of canals in operation in all the United States, and 1,828 miles more were in the process of construction. Louisville was rejoicing in the completion of a canal around the falls of the Ohio; Ohio and Indiana were rapidly pushing the work on the canals that were to tap the regions hitherto tributary only to the Mississippi; the construction of the Pennsylvania Canal was being hurried forward to enable Philadelphia to recover the trade lost to the Erie; Maryland and Virginia were persistently going on with the building of the waterway westward from Chesapeake Bay. And meanwhile 44 miles of railway had been completed and were in operation, and to show that confidence in the new device was not lacking, 422 miles were in the process of construction and 697 miles more were already projected. II 1830-1860 The years between 1830 and 1860 witnessed a remarkable expansion of the United States in area, population and wealth. By the annexation of Texas and by treaties with England and Mexico, nearly a million square miles of territory were added to the national domain and the western boundary was pushed to the Pacific Ocean. The total number of people increased in the thirty years from 12,866,020 to 31,443,321; the total wealth from about $2,000,000,000 to more than $16,000,000,000. It was a period of great prosperity for all branches of industry. As the tide of settlers swept over the fertile lands drained by the Mississippi River and Great Lakes, the agricultural production of the country increased with amazing rapidity. The production of corn in 1859 was almost 1,000,000,000 bushels; of wheat and oats 175,000,000 bushels each, and of cotton 4,300,000 bales, while the live stock of the country that year, including, among other animals, 25,000,000 cattle, 22,000,000 sheep and 33,000,000 swine, was valued at $1,000,000,000. The exploitation of the mineral resources of the nation was carried on more rapidly. From 300,000 tons of coal mined in 1830, the quantity grew to 13,000,000 tons in 1860; the iron mines turned out 1,000,000 tons of ore in 1860, the copper mines 7,000 tons and the lead mines 15,000 tons, while the production of gold in the far West, which began in 1849, averaged $55,000,000 annually during the following ten years. Manufacturing likewise grew in importance, the value of its products rising to nearly $2,000,000,000 in 1859. The tendency toward a territorial division of industry was accentuated during this period.