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===Where they come from===

===Where they come from===

[[Mexico]] is the source of the about half of the recent illegal immigrants to the United States. Most arrive legally and over-stay their visas. Others cross the border mostly through the desert southwest or less often by swimming across the [[Rio Grande]].  

[[Mexico]] is the source of the about half of the recent illegal immigrants to the United States. Most arrive legally and over-stay their visas. Others cross the border mostly through the desert southwest or less often by swimming across the [[Rio Grande]]. [[Canada]] is another large source. Currently estimates show around 70,000 undocumented Canadian workers work in the U.S. They come over from the border with [[Canada]] along the northern part of the United States which is not nearly as secure as the southern border with [[Mexico]].

 

====Dispute with Mexico====

====Dispute with Mexico====

The United States receives constant criticism from the Mexican government for its efforts to curb illegal immigration. And United States officials criticize Mexican officials for passing out handbooks on how to cross the border, saying Mexico is trying to avoid political and governmental reforms at home by encouraging its citizens to leave.  

The United States receives constant criticism from the Mexican government for its efforts to curb illegal immigration. And United States officials criticize Mexican officials for passing out handbooks on how to cross the border, saying Mexico is trying to avoid political and governmental reforms at home by encouraging its citizens to leave.

===Legal aspects===

===Legal aspects===