The problem of poverty is systemic - trying to link it to immigration confuses correlation with cause.
> Why are low-skilled immigrants a net drain on society, but not the low-skilled children or grandchildren of immigrants?
Because those children are a sunk cost: they’re already here. Why compound the problem? The demand to come to the US is far too high to simply accept anyone who can make it here. And the fact that a greater percentage of immigrants are accepting welfare vs “natives”[2] indicates that we really are compounding the problem. We should be going almost exclusively for skilled immigration, like Australia does.
1: http://www.exodus2013.co.uk/immigrants-who-returned-home/ 2: https://www.usatoday.com/story/news/nation/2015/09/01/immigr...