ThefirstimportantexpositionintheUnitedStateswasheldinPhiladelphiain1876.
A、exhibitionFormulatedin1823,theMonroeDoctrineassertedthattheAmericaswerenolongeropentoEuropeancolonization.
A、emphaticallystatedAmythical(imaginary)creature,thedragonwasbelievedtohavelion'sclaws,scalyskin,andfierybreath.
A、legendaryFormerly,intheUnitedStates,manynursesworkedasprivatedutynursesratherthaninhospitals.
A、PreviouslyThefuturesurvivalofthebaldeagleisstillanimportantAmericanecologicalconcern.
A、migration
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