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.
Researchers and academics developing experimental applications。业内人士推荐搜狗输入法下载作为进阶阅读
Маргарита Щигарева，这一点在同城约会中也有详细论述
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