Sprawling epic which follows the Prescotts, an emigrant family through four generations, from the Erie Canal in the 1830's to their settled home in the West a half a century later. On the way they encounter river pirates, and escape with the help of fur trapper Linus Rawlings (James Stewart), who subsequently marries one of their daughters, Eve (Carroll Baker). The parents are drowned on a foundering raft, and the other daughter Lilith (Debbie Reynolds) becomes a riverboat singer and catches the eye of a genteel adventurer Cleve Van Valen (Gregory Peck). They cross the plains together in a wagon train and make and lose a fortune in California; meanwhile Linus has turned farmer and, comes the Civil War, joins the Union Army and is killed at the Battle of Shiloh. One of his sons Zeb (George Peppard) also joins the army and stays after the war as a cavalry officer and is sent to Colorado to help guard the pioneering railroad against the Indians, whose land they are crossing. By this time Lilith is the elderly lady of the family, having survived long enough to see the dream of settlement realized, but not, mercifully, the aerial shots of the Los Angeles freeway traffic with which the film ends.