Did the prescott family really exist in how the west was won?

Yes, the Prescott family in "How the West Was Won" is a fictional representation created for the film, which was released in 1962. The story, spanning several decades of American westward expansion, features the Prescott family as they encounter various historical events and challenges. While the film includes real historical elements and figures, the Prescotts themselves are not based on a specific historical family.