MackeEnzie’s Granp DEsicn ISI Certainly the new North West Company was far more vigorous in expanding the area of its operations than had been the old con- cern under McTavish. At last others followed the trail which Mackenzie had blazed. Thomp- son, Fraser, Harmon, Henry, to name some of the leading figures, pushed through the moun- tain barriers and opened posts up and down the interior of British Columbia; new passes were discovered, new regions opened to trade. Soon Thompson and Fraser both reached the sea, Fraser in 1807 by the Fraser River, Thompson in 1811 by the Columbia. Prob- ably these activities of the North West Com- pany alone prevented the Pacific coast from becoming a part of the United States, even though the Company was still hampered by the restrictions which Mackenzie was labour- ing to remove. Lewis and Clark in 1805 crossed the continent for the American gov- ernment—a journey sometimes ignorantly referred to as the first transcontinental expe- dition; in 1811 Astor’s Pacific Fur Company built a fort at the mouth of the Columbia. The North West Company’s servants were