In1803,theUnitedStatesboughtahugeareaoflandfromFrance.ItwascalledtheLouisianaPurchase.Itdoubledthesizeoftheyoungcountry.PresidentThomasJeffersonwantedtoknowwhatwasoutthere.HeaskedMeriwetherLewisandWilliamClarktoleadagroupofexplorerscalledtheCorpsofDiscovery.Theirjobwastomaptheland,studyplantsandanimals,andfindawaterroutetothePacificOcean.
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