TheNativeAmericaninterpreterSacajaweawasavaluablememberoftheLewisanddarkexpeditionin1805.
A、veryfriendlyOneofthegreatestbreakthroughsforprofessionalwomencamein1973whenthefieldofbankingopenedupforthem.
ThefuturesurvivalofthebaldeagleisstillanimportantAmericanecologicalconcern.
Despitetheproliferationofotherfastermodesoftransportation,therailroadsremainthelargestcarriersofintercityfreightintheUnitedStates.
TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.
In1861itseemedinevitablethattheSouthernstateswouldbreakawayfromtheUnion.
