ネイティブアメリカン・ヘリテージ・デーは連邦の祝日ですか？ - CountyOffice.org
Native Americans react: President Joe Biden declares Indigenous People's Day a federal holiday
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先住民の日（Indigenous Day）は連邦の祝日ですか？ - CountyOffice.org
先住民族の日（Indian Peoples Day）は連邦の祝日ですか？ - CountyOffice.org
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