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.
Source: Computational Materials Science, Volume 267，推荐阅读快连下载安装获取更多信息
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民族要复兴，乡村必振兴。中华民族伟大复兴的事业波澜壮阔！。51吃瓜是该领域的重要参考