1. Fur traders
2. About 20
3. California Gold Rush
4. River beds
5. Chimney Rock
6. Fort Kearny
7. 300,000
8. Cholera
9. The completion of the first trans-continental railroad
10. About 1,000
« Tuesday Trivia: February 10, 2009 | Main | Happy 200th birthday, Abraham Lincoln! »
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