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城市表情时间：12月19日地点：北京场景：日出映照慕田峪长城。图/视觉中国SourcePh" style="display:none"，详情可参考谷歌浏览器【最新下载地址】
Negative net migration hasn’t definitively happened in the U.S. for almost a century, not since the Great Depression. The U.S. native-born population is also in free fall, well below the replacement rate needed to maintain population numbers in the long run. With fewer immigrant arrivals already dealing a blow to the workforce, the shrinkage of the American taxpayer base is set to further widen the country’s deficit and hurt its prospects for economic growth.