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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.。关于这个话题，雷电模拟器官方版本下载提供了深入分析
12月21日，嘉宾敲锣宣布先农坛庆成宫正式面向社会公众开放。本版摄影/新京报记者 浦峰。WPS下载最新地址是该领域的重要参考
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