I often point out that the immigration websites contain a lot of mis-info. This issue of how many were deported proves that.
Your link to a google searh yielded VDare at the top. That article uses the phrase, "possibly a million".
Below that is found a very informative article published in the Handbook of Texas History, which is a very credible source. The phrase that they use, "The INS claimed 1,300,000 though the number officially apprehended did not come anywhere near this total".
uh deported and apprehended means by the government, and does not include those who left voluntarily before they were apprehended..sheesh...