永住権保持者が米国市民権を取得する手続き。通常、グリーンカード取得から5年(米国市民の配偶者は3年)の継続居住が必要です。英語テストと市民権テスト(米国の歴史・政府に関する問題)に合格し、宣誓式を経て市民権が付与されます。
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