“This requirement traces its roots all the way back to the Immigration and Nationality Act of 1952. However, it’s worth remembering two rather amusing facts about the law as it originally stood: it only required United States citizens to bear a ‘valid passport’ and not a ‘valid United States passport’, and it only applied in time of war or national emergency. In 1994, a ‘technical amendment’ added the requirement that the passport used by a U.S. citizen to enter the United States be a U.S. passport. The restriction that the harsh passport control laws would only apply in wartime was removed by the Foreign Relations Authorization Act for Fiscal Year 1979.”
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