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1、英文介绍美国知识UnitedStatesofAmerica(UnitedStatesofAmerica)isa50statesandoneFederalTerritorySARconstitutionalfederalrepubliccomposed.TheEastAtlanticOcean,westPacific,northofCanada,southofMexico.U.S.landareamorethan9.62millionsquarekilometers,rankingthirdintheworld.Thetotalpopulationhasmorethan300million
2、people,lessthanChinaandIndia.July4,1776,theContinentalCongressformallyadoptedinPhiladelphia,"theDeclarationofIndependence,"declaredtheU.S.wasborn.Sincethe1870s,theU.S.ranksfirstintheworldeconomyon.AmericatodayisoneoffivepermanentmembersofUNSecurityCouncil,anditsglobalpolitical,economic,military,e
3、ntertainmentandmanyotherareasofthehugeinfluenceisunmatchedbyothercountries.地理环境U.S.islocatedincentralNorthAmerica,theterritoryincludesNorthAmerica,AlaskaandthenorthwestHawaiianIslands,thecentralPacific.TheNorthandtheCanadianborder,souththroughtheGulfofMexico,westPacificOcean,eastAtlanticOcean.Coa
4、stlineof22,680kilometers.Mostoftheregionistemperatecontinentalclimate,subtropicalclimateinsouthernandwesterncoastalareasoftemperatemarineclimateandthedistributionofMediterraneanclimate.NorthCentralPlains(CentralPlains)largetemperaturedifference,theaveragetemperatureofChicagoinJanuary-3℃,7月24℃;the
5、GulfCoastinJanuarytheaveragetemperatureof11℃,7月28℃.ThelowestpointofDeathValley(DeathValley,-86m),highestpointMountMcKinley(MountMckinley,6,198m).历史BeforethecolonialperiodIn40000yearsago,agroupofvagrantsfromAsiathroughNorthAmericatoCentralandSouthAmerica,theancestorsofthesepeopleareIndians.WhenCol
6、umbusreachedtheNewWorldwhenhethought,theIndianslivinginAmerica,about3,000million,ofwhichabout2,000peopleliveinwhatisnownorth-centralCanadaandtheUnitedStates,whileamajoritylivedinwhatisnowMexicoandthesouthernUnitedStates.About1millionyearsago,thereisanothergroupofAsians,movedtonorthernNorthAmerica
7、,whichislaterEskimos.ThefirstwhitepeopletotheAmericasabouttheVikings,theyarepeoplewholikefishingadventure,itwas1,000yearsagothattheyhadvisitedtheeastcoastofNorthAmerica.ThecolonialperiodIn1607,agroupofabout100peopleint
