Bytheearly20thcentury,astheUnitedStatesbecameaninternat...
問題詳情：Bytheearly20thcentury,astheUnitedStatesbecameaninternationalpower,itsculturalself-identity(認同)becamemorecomplex.TheUnitedStateswasbecomingmorediverseasimmigrantsstreamedintothecountry,settli...