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1、TPO20TPO20-1WestwardMigration[Para.1]ThestoryofthewestwardmovementofpopulationintheUnitedStatesis,inthemain,thestoryoftheexpansionofAmericanagriculture-ofthedevelopmentofnewareasfortheraisingoflivestockandthecultivationofwheat,corn,tobacco,andcotton.After1815improvedtransp
2、ortationenabledmoreandmorewesternfarmerstoescapeaself-sufficientwayoflifeandenteranationalmarketeconomyduringperiodswhencommoditypriceswerehigh,therateofwestwardmigrationincreasedspectacularly.“OldAmericaseemedtobebreakingupandmovingwestward,”observedanEnglishvisitorin1817
3、,duringthefirstgreatwaveofmigration.Emigrationtothewestreachedapeakinthe1830’s.Whereasin1810onlyaseventyoftheAmericanpeoplelivedwestoftheAppalachianmountains,by1840morethanathirdlivedthere.[Para.2]Whywerethesehundredsofthousandsofsetters-mostofthemfarmerssomeofthemartisans
4、-drawnawayfromtheclearedfieldsandestablishedcitiesandvillagesoftheEast?CertaincharacteristicsofAmericansocietyhelptoexplainthisremarkablemigration.TheEuropeanancestorsofsomeAmericanshadforcenturieslivedrootedtothesamevillageorpieceoflanduntilsomereligious,political,orecono
5、miccrisisuprootedthemanddrovethemacrosstheAtlantic.Manyofthosewhoexperiencedthissharpbreakthereafterlackedthetiesthathadboundthemandtheirancestorstoasingleplace.Moreover,Europeansocietywasrelativelystratified;occupationandsocialstatuswereinherited.InAmericansociety,however
6、,theclassstructurewaslessrigid;somepeoplechangedoccupationseasilyandbelieveditwastheirdutytoimprovetheirsocialandeconomicposition.Asaresult,manyAmericanswereaninveteratelyrestless,rootless,andambitiouspeople.Therefore,thesesocialandeconomicposition.Asaresult,manyAmericansw
7、ereaninveteratelyrestless,rootless,andambitiouspeople.Therefore,thesesocialtraitshelpedtoproducethenomadicanddaringsettlerswhokeptpushingwestwardbeyondthefringesofsettlement.Inaddition,therewereotherimmigrantswhomigratedwestinsearchofnewhomes,materialsuccess,andbetterlives
8、.[Para.3]Thewesthadplentyofattractions:thealluvialriverbottoms,thefecundsoilsoftherolling
