Dary introduces us to the pioneers: trailblazers, fur-traders, and missionaries, who made the first journeys to Oregon County, an internationally disputed territory comprising present-day Washington, Oregon, and California. We learn of the road's steadily increasing popularity, as economic problems or the promise of adventure and wealth lead thousands of homesteaders, gold-rushers, and entrepreneurs to pile their hopes and dreams into wagons and head west. Using journals and letters, as well as company and expedition reports, public records and newspaper stories, Dary takes us inside the day to day experiences of the travelers, as they risked ruin at every step from disease, weather, and human deceit. Trail.

Through Dary's expert and comprehensive history, we learn how the events of the day turned a small trickle of pioneering men and women into the greatest mass migration in American history.