Which tribe had been fighting invading sioux tribes from the northeast just prior to the period of lewis and clark but lost their fight due to a devastating smallpox epidemic in 1802? omaha osage osage shoshone

Omaha

Explanation:

The Omaha tribe was located in Nebraska and are present in the Lewis and Clark notes. This era the tribe was fighting against the Sioux tribes of northeastern Nebraska shortly before the Lewis and Clark period began their expedition, but lost the fight due to a devastating smallpox epidemic in 1802 that nearly decimated the entire population. The name Omaha means "those who go against the flow".

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i used to know but i learned it a long time ago sorry

explanation: