米国の社会保障番号。就労、銀行口座開設、クレジットカード申請、運転免許取得に必要な9桁の番号です。E-2ビザ保持者は入国後に社会保障局（SSA）で申請でき、通常2〜4週間で届きます。SSNは個人情報の要であり、厳重な管理が必要です。
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