- 问题详情:Bytheearly20thcentury,astheUnitedStatesbecameaninternationalpower,itsculturalself-identity(认同)becamemorecomplex.TheUnitedStateswasbecomingmorediverseasimmigrantsstreamedintothecountry,settlingespeciallyinAmerica’sgrowingurbanareas.Atthisti...
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