After the Americans assumed control, in 1816, Congress forbade the British to conduct the fur trade in our country. This was to prevent them from influencing the Western Indians to war; but turning out the English traders served greatly to help the American Fur Company, founded by John Jacob Astor, and having its headquarters on the Island of Mackinac. Nevertheless the agents, the clerks, and the _voyageurs_ were still nearly all of them Frenchmen, as of old, and there was really very little change in the methods of doing business, except that Astor managed to reap most of the profits. [Illustration: JOHN JACOB ASTOR] The fur trade lasted, as a business of prime importance to Wisconsin, until about 1835. It was at its greatest height in 1820, at which time Green Bay was the chief settlement in Wisconsin. By 1835 new interests had arisen, with the development of the lead mines in the southwest, and with the advent of agricultural settlers from the East, upon the close of the Black Hawk War (1832). The fur trade led the way to the agricultural and manufacturing life of to-day. The traders naturally chose Indian villages as the sites for most of their posts, and such villages were generally at places well selected for the purpose. They were on portage trails, where craft had to be carried around falls or rapids, as at De Pere, Kaukauna, Appleton, and Neenah; or they were on portage plains, between distinct water systems, as at Portage and Sturgeon Bay; or they were at the mouths or junctions of rivers, as at Milwaukee, Sheboygan, Oshkosh, Lacrosse, and Prairie du Chien; or they occupied commanding positions on lake or river bank, overlooking a wide stretch of country. Thus most of the leading cities of Wisconsin are on the sites of old Indian villages; for the reasons which led to their choice by the Indians held good with the white pioneers in the old days when rivers and lakes were the chief highways. Thus we have first the Indian village, then the trading post, and later the modern town. The Indian trails were also largely used by the traders in seeking the natives in their villages; later these trails developed into public roads, when American settlers came to occupy the country. Thus we see that Wisconsin was quite thoroughly explored, its principal cities and highways located, and its water ways mapped out by the early French, long before the inrush of agricultural colonists. IN THE OLD FRENCH DAYS In establishing their chain of rude forts, or trading posts, along the Great Lakes and through the valley of the Mississippi, the French had no desire to plant agricultural settlements in the West. Their chief thought was to keep the continental interior as a great fur bearing wilderness; to encourage the Indians to hunt for furs, by supplying all their other wants with articles made in Europe; and to prevent them from carrying any of their furs to the English, who were always underbidding the French in prices.