So I remember learning in US history that the Spanish viewed the expedition as a threat to their posessions in the west and sent expedition in an attempt to intercept them. What if Lewis and Clark and intercepted by the Spanish?
http://teachinghistory.org/history-content/ask-a-historian/24290
http://history.nd.gov/exhibits/lewisclark/foreignreaction.html
http://www.lewis-clark.org/article/752
http://teachinghistory.org/history-content/ask-a-historian/24290
http://history.nd.gov/exhibits/lewisclark/foreignreaction.html
http://www.lewis-clark.org/article/752