出演者一覧（15名）
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John Logan Allen
Himself - Geographer
Stephen E. Ambrose
Himself - Historian
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Gerard Baker
Himself - Mandan-Hidatsa
Kevin Conway
Patrick Gass
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Erica Funkhouser
Herself - Writer
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William Least Heat-Moon
Himself - Writer
Gene Jones
Joseph Whitehouse
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Mylie Lawyer
Herself - Descendant of Twisted Hair
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James P. Ronda
Himself - Historian
Murphy Guyer
William Clark (voice)
ハル・ホルブルック
Narrator (voice)
サム・ウォーターストン
Thomas Jefferson (voice)
Adam Arkin
Merriwether Lewis (voice)
マシュー・ブロデリック
John Ordway (voice)
Dayton Duncan
Himself - Writer