Having started upstream on the Missouri River<span> from their </span>St. Louis<span>-area camp—where they had been preparing for the expedition since fall 1803—on May 14, William Clark and nearly four dozen other men met up with Meriwether Lewis on May 20. hth</span>
C because Great Britain thought the colonies cause the war
They were looking for the "Northwest Passage" to the sea. Or basically seeing where America ended in the northwest side of the country.
Hope this helps :)
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