Urbanrenewalprogramsstrivetoupgradeareasthatarebecomingslums.
A、reproachOneofthegreatestbreakthroughsforprofessionalwomencamein1973whenthefieldofbankingopenedupforthem.
Formulatedin1823,theMonroeDoctrineassertedthattheAmericaswerenolongeropentoEuropeancolonization.
TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.
TheNativeAmericaninterpreterSacajaweawasavaluablememberoftheLewisanddarkexpeditionin1805.
In1974HenryAaronbrokeBabeRuth'smonumentallifetimerecordof714homeruns.