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美国近年生育率下降，加上婴儿潮时期出生的人渐渐老去，出现人口老化危机。美国人口统计局最近公布，指新移民已成国内人口增长关键。若华府完全禁止接收移民，美国总人口将在2035年起开始下降，并且影响经济。

人口统计局根据2011年至2015年的移民数据，估计减少一半移民名额、增加一半移民名额，及完全禁止接收移民3种情况，对美国人口的影响。结果发现，如果减少一半移民名额，美国人口在未来40年仍能增加5300万人。然而，若完全禁止接收移民，人口很快就会开始下降，到2060年，总人口会降至3亿2000万人。

不过，在上述3种情况下，美国65岁以上老人的人口，也将超过18岁以下人士；但若移民人口较多，人口老化情况则可延迟至2045年才发生。如果完全禁止接收移民，老年人人口在2029年，就会多于儿童人口；而白人人口比例亦不会因而有所增长。

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