your comparison is inflammatory and totally incorrect.
If 12 million Africans came over our borders in the 17 and 1800s they would have been shot on sight.
We all know how that slavery thing worked out for this country, dude.
Millions of Americans dead in Civil war.
I don't think it's totally incorrect - as a percentage of the South, at least, slave imports surpassed Hispanic immigration. As for another "Civil War", I think that is what this compromise legislation is seeking to head off.