The Trapper's Trail links the Great Platte River Road at Fort Laramie and a trail pioneered in 1821 by who?
Trapper's Trail: The Trapper's Trail is a north-south path along the eastern base of the Rocky Mountains that links the Great Platte River Road at Fort Laramie and the Santa Fe Trail at Bent's Old Fort. Santa Fe Trail:  Pioneered in 1821 by William Becknell, it served as a vital commercial highway until the introduction of the railroad to Santa Fe in 1880.
William Becknell