Prior to the War of 1812, the United States nominally owned the far reaches of the
Northwest Territory — Michigan, Wisconsin and northern Illinois — but was too weak to effectively assert sovereignty in the region. After that war, federal authorities began a systemic program of exploration, fort building, arrangements of treaties between tribes, purchasing of land from tribes, surveying, and licensing of merchants (primarily fur traders). In this atmosphere, young merchants from throughout New York and New England departed from western New York and travelled up the
Great Lakes to various towns and outposts to engage in trade. Whitney was one such merchant, settling in Green Bay in 1819. Whitney engaged in a series of trade expeditions, sometimes by himself but usually while employing hired hands as
voyageurs, freight haulers and clerks. In these expeditions, Whitney explored the Fox to its source, and the Wisconsin from
Point Basse to
Prairie du Chien. He established trading posts on the upper
Mississippi to the west and
Sault Ste. Marie to the north beyond
Mackinac. In 1821-22 he was the
sutler at
Fort Snelling (modern day
Minneapolis). In one trading trip, he travelled from Fort Snelling to Detroit by foot with one assistant to help haul the goods and supplies on a
toboggan. Through these early trips, Whitney gained first-hand knowledge of the conditions under which his future enterprises would be founded. In the lower Fox Valley, Whitney had several establishments developed, including a large frame building store in the vicinity of Fort Howard. This store supplied the needs of settlers, traders, farmers and the growing government administrative staff of officials who were responsible for the region, then part of
Michigan Territory. About 20 miles upstream at Grand Kaukauna he maintained a store on the south shore of the Fox (which runs east and west at that point), which served the needs of the Stockbridge Indians who had a settlement there. The store was often managed by an associate, such as his nephew David Whitney. The Stockbridge eventually sold and abandoned that site, but in the course of their stay Whitney developed more general business relationships with them, often employing Stockbridge in his other businesses around the state. During this same period Whitney was engaged as a contract supplier to the federal facilities at
Fort Crawford,
Fort Howard and
Fort Winnebago. ==Lumbering interests==