Infrastructure is a large issue. Border towns can become saturated, which will reduce living conditions, and when immigrants move to larger cities, they can often have trouble finding places to live. A lot of this can be because of a communication barrier. Sometimes that is because there are too few to translate, but there can also be educational issues. As much maligned as the US education system is, it is better than some others, and when your culture eschews school for an early start at earning a paycheck, communication in any language becomes a challenge.
Many issues can be overcome, or at least minimized, by compassionate workers, which many that work with immigrants are, but there isn’t enough funding to get compassionate people where they are most needed. Supporting increased budgets at the border isn’t always about putting guns on the border, it can be about improving the infrastructure that helps get people where they need to be in more efficient ways. I’m starting to ramble, though, and I think I’ve given a partial answer to your question.