35第35章 (1/2)

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TheUnitedStatesofAmerica,commonlyreferredtoastheUnitedStatesorAmerica,isafederalpresidentialconstitutionalrepubliclocatedprimarilyinNorthAmerica.Itisoneofthemostinfluential,powerful,andculturallydiversenationsinmodernhumanhistory.Comprisingfiftystates,onefederaldistrictWashington,D.C.,andseveraloverseasterritories,thecountryspansavastgeographicalareawithextremelyvariedlandforms,climates,andecologicalenvironments.Astheworld’sthird-largestcountrybytotalareaandthird-mostpopulousnation,theUnitedStatespossessesunparalleledcomprehensivenationalstrengthinpolitics,economy,military,scienceandtechnology,education,andculturalexport.Formorethanacentury,ithasmaintainedaleadingpositioninglobalindustrialinnovation,internationaltrade,technologicalresearchanddevelopment,andcross-culturalcommunication,profoundlyshapingthemodernworldorder,internationalrules,andglobalpopularculture.





ThehistoryoftheUnitedStatesisrelativelyshortcomparedwithancientcivilizationsinAsia,Africa,andEurope,yetitsdevelopmentspeedandinstitutionalevolutionareunprecedented.Bornfromcolonialindependencemovements,forgedthroughcivilwarandinstitutionalreform,andstrengthenedbytwoworldwarsandcontinuoustechnologicalrevolutions,theUnitedStateshasgrownfromafledglingagriculturalconfederationintoasuperpowerthatdominatesglobalpolitics,economics,andtechnology.Itsuniquenationalcharacter,formedbyimmigration,frontierspirit,individualism,andliberalism,distinguishesAmericansocietyfromallothernationsandcreatesbothitstremendousvitalityandinherentsocialcontradictions.Thisarticleprovidesasystematic,comprehensive,andin-depthintroductiontotheUnitedStatesfromtheperspectivesofgeography,history,politics,economy,culture,education,scienceandtechnology,society,ethnicity,foreignrelations,andfuturedevelopment.





1.GeographicOverview





1.1GeographicLocationandTerritorialComposition





ThemainterritoryoftheUnitedStatesissituatedincentralNorthAmerica,borderedbyCanadatothenorth,Mexicotothesouth,theAtlanticOceantotheeast,andthePacificOceantothewest.Inadditiontothecontiguousforty-eightstatesandthefederalcapitaldistrict,theUnitedStatesincludestwonon-contiguousstates:AlaskainnorthwesternNorthAmericaandHawaiiinthecentralPacificOcean.Italsogovernsmultipleoverseasterritoriesandpossessions,includingPuertoRico,Guam,theNorthernMarianaIslands,AmericanSamoa,andtheU.S.VirginIslands.Thiscross-continentalandocean-spanningterritorialstructureenablestheUnitedStatestohavestrategicaccesstotheAtlantic,Pacific,Arctic,andCaribbeanwaters,layingacrucialgeographicalfoundationforitsglobalmilitarydeploymentandmaritimehegemony.





ThetotallandareaoftheUnitedStatesisapproximately9.8millionsquarekilometers.Itsterritoriallayoutfeaturescompletegeographicaldiversity,coveringalmostalllandformtypesonEarth,includingtoweringmountainranges,vastplains,rollingplateaus,denseforests,ariddeserts,fertilebasins,andintricateriversystems.SuchcomplexanddiversegeographicalconditionsendowtheUnitedStateswithextremelyrichnaturalresourcesandecologicaldiversity,supportingthelong-termdevelopmentofitsagriculture,industry,energyindustry,andtourism.





1.2LandformandClimateCharacteristics





TheterrainoftheUnitedStatespresentsanobviousthree-layerlongitudinaldistribution.Thewesternregionisdominatedbytoweringmountainsystems,includingtheRockyMountains,SierraNevada,andCascadeRange.Thesenorth-southtrendingmountainsformthetopographicalbackboneofwesternAmerica,withnumeroushigh-altitudepeaks,alpinelakes,glaciers,andv--


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