Mountain men (people who knew a lot about living in mountainous places) had found a passway over the Rocky Mountains, and they named it the South Pass. This path helped many wagons to reach the west coast. In 1836 a missionary named Marcus Whitman crossed through the pass with his wife to Oregon. This proved that it was possible for others with women and families to go too, and because of this, Oregon suddenly became the place pioneers wanted to make a trip to.