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Immigrant America: A Portrait

This flow does not represent an "alien invasion," as some authors called it, because an invasion implies moving into someone else's territory against their will. In this instance, the movement is very much welcomed, if not by everyone, at least by an influential group - namely, the urban employers and rural growers who have come to rely on this source of labor. [p.17]

This flowっていうのは労働移民の流入のこと。こういうユーモアのセンスってすばらしいと思う。