- 問題詳情:ThebasicflagoftheUnitedStatesisoneoftheworld’soldestnationalflags.OnlythebasicflagsofAustria,Denmark,GreatBritain,theNetherlands,Sweden,andSwitzerlandareolder.DuringthediscoveryandsettlementofwhatisnowtheUnitedStates,theflagsofvariousEuropea...
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