Immigration from one country, Mexico, is 2.5 times that of many countries combined.
I've taken the figures from the above table at cis.org and graphed them.
Note the sharp increase in immigration from Mexico and how that differs from all other regions' increase. Note also the sharp decline in immigration from Europe while all other regions have increased.
Roughly 63% of illegals are Mexican.
Do the math. “As of March 2010, 11.2 million unauthorized immigrants were living in the United States” http://www.pewhispanic.org/2011/02/01/unauthorized-immigrant-population-brnational-and-state-trends-2010/
Then see Figure 2 at http://www.pewhispanic.org/2011/02/01/ii-current-estimates-and-trends/
The main article is at the first link. Be sure to check the Appendices.
Many of our illegal aliens are visa overstayers or people who may follow the schedule of their visas (e.g. go home every 6 months) but violate other terms of their visas such as working under the table.
I’ve known many from Mexico (as well as other countries) who flew in on commercial flights on visas or visa wavers but stayed/worked here illegally. Focusing just on Mexicans who never talk with a border patrol agent misses the vast majority.
Sorry, I was off on a tangent and missed your main point. Yes, 63% (I’ve read 57 but that may be an old number) are from Mexico. That may be the case in aggregate or amongst those who are ‘undocumented’ (never had any visa). Either way, I hope enforcement happens against all illegal aliens and not just ones from a specific country. We need interior enforcement.
