In the spring of 1843, nearly one thousand people gathered in Independence, Missouri. They came from all over the eastern United States, and many had to sell most of their possessions to afford the trip. Yet their journey was just beginning. The group set out for Oregon Country, a four- to six-month trek across plains, mountains, valleys, and rivers. Not everyone survived the difficult trip. Still, before the end of the 1800s, many more wagon trains...