Channelization of Undocumented Mexican Migrants to the U.S.
研究发现墨西哥无证移民在美国仅集中在加州、得州和伊利诺伊州等少数州，且移民流动在墨西哥与美国特定次区域之间呈现强烈的渠道化特征，这种格局受历史和经济力量驱动，难以通过美国限制性边境政策简单阻断。
Undocumented migration from Mexico, which has accellerated markedly over the last ten years, has stimulated enough research that it is now possible to generalize about geographic distributions of migrants in Mexico and in the United States. Such migration is a widespread phenomenon in Mexico, with a majority of states participating significantly. In the U.S., however, only a few states are significant recipients of undocumenteds, with California, Texas, and Illinois accounting for almost nine-tenths of the total. Undocumented migration tends to be strongly channelized between specific Mexican and U.S. subregions. Texas and California have documented in-migration fields which differ in their locations, in the role of distance in their configurations, and in the factors which generate the flows. These channelized flows are tied to historical and economic forces, and they cannot be simply turned off by restrictive border policies on the part of the United States.