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Tightening up the borders does seem to be having some effect. The migrants (apparently most of whom are illegal) are trekking back to Mexico, probably not to return for some time. Hopefully they will seek a legal admission when they do choose to return. There has never been much disagreement with the concept of legally admitted workers, but the strain came when huge numbers of undocumented individuals, some of whom may not have been seeking honest labor, came swarming into the US. As long as our economy was stable or expanding, these people could be absorbed, but when everybody is crippling along, they have become a luxury we cannot afford any longer. So home they go. Perhaps they may apply their newly acquired skills to bolster and enrich the economies of their home towns.