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.
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。关于这个话题，safew官方版本下载提供了深入分析
Daniel Larlham Jr.。业内人士推荐Line官方版本下载作为进阶阅读
Small chunks (1KB × 5000)，这一点在搜狗输入法下载中也有详细论述
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