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The Santa Fe Trail was America's first commercial highway. ... Before its demise due to the completion of the Santa Fe railroad, the Santa Fe Trail served as a thoroughfare for countless traders, pioneers and America's military, and it played a crucial role in America's westward expansion.
It is also known as the Oregon-California Trail. This path allowed early pioneers to migrate into western United States. ... The trail was the only way migrants could travel by land. They used mules and oxen to pull their covered wagons.