"This paper examines the effects of illegal immigration in a neoclassical growth model with two groups of workers, skilled and unskilled. We show that although illegal immigration is a boon to a country as a whole, there are distributional effects, whose sign is in general ambiguous. This is because all sources of income of both groups are affected and some of these changes tend to move income in opposite directions. Nevertheless, calibration exercises show that the wealth distribution is likely to become more unequal as the number of illegal immigrants increases. We confirm most of our calibration results analytically in a small open economy version of the basic model. Finally, our results remain robust when we extend the model to allow for endogenous skill acquisition."
That in no way precludes the veracity of any of the accepted data. The text obviously refers to state counties and regions in the US, and that's an important distinction. The wealth gap is widening with or without undocumented immigrants. Yes more than half are hispanic so what? That population hasn't grown greatly in a decade while others are, and that is what is accounting for the spike at the southern border.
Maybe it would be more practical if we build a wall at Mexico's southern border...and we pay for it!