So far our rights to the region were based on priority in discovery, in exploration, and in occupation; but now for a period of thirty years the British Hudson Bay Company was to have almost undisputed possession. However, the rights established by Gray, Lewis and Clark, and Astor did not lapse and could not be set aside through occupation by a mere trading company. During nearly all of this thirty-year period the Boston schoolmaster, Hall J. Kelley, was agitating the colonization of Oregon, and in 1832, and again in 1834, Nathaniel J. Wyeth, with herculean effort, indomitable perseverance, and incredible energy led expeditions to the Columbia only to meet with disaster when with his slender means he was pitted against the mighty corporation in possession here. With Wyeth came the first party of missionaries. The "Mountain Men"--retired trappers--soon followed, seeking homes here; and, beginning with 1842, annual migrations of thousands of Oregon pioneers were on the way. The Lewis and Clark exploration had thus led to a national movement--"the migration of a people," says Captain Chittenden, "seeking to avail itself of opportunities which have come but rarely in the history of the world, and which will never come again." The route traced by these Oregon pioneers will some day be restored as a national memorial highway, and will be celebrated in song and story, every mile of which has the tenderest associations of hardship and suffering, but also of high purpose and stern determination; and yet the Oregon trail was in the strictest sense a derivative of the Lewis and Clark trail. For nearly twenty years the Lewis and Clark route up the Missouri River had been the only one used to reach the Rocky-mountain wilderness, but in the fall of 1823 a party of trappers, pushing westward from the Yellowstone and desirous of avoiding the implacable Blackfeet on the Upper Missouri, turned to the south and discovered in South Pass, an easy crossing of the Rocky Mountains. The region beyond on the headwaters of the Green and Snake rivers, and in the basin of the Great Salt Lake, was found to be rich in furs. Henceforth to some point in this region the annual cavalcades of the fur companies would come and there meet their own trappers, the free trappers, and the Indians of all the interior country. This was the annual rendezvous for trading, for the delivery of the season's catch of furs, and for equipment for the next year's activity. In making this annual round trip from Saint Louis the original route into this transmontane country, the half-circle route along the Missouri, was naturally abandoned for a great cut-off from the western borders of Missouri to the South Pass. A direct route northwestward across the plains of present Kansas and Nebraska to the Platte, up the Platte and the North Fork and its tributary, the Sweetwater, was found to be the finest natural highway in the world. To reach Oregon the pioneers took