Gillian Tett of the FT summarizes research from the Dallas Fed:
...when it comes to immigration – of the legal and illegal kind – the Lone Star Fed is not sitting with the Tea Party core. On the contrary, it has just published a paper – under the provocative title “Gone to Texas” – arguing that immigration is good for the local economy. And it rebuffs the idea that immigrants are stealing jobs from native-born Americans. On the contrary, it insists, they tend to boost growth in a win-win way.
Now, if this conclusion had emerged in a state with few immigrants and plenty of unfilled jobs (think North Dakota), that might be unsurprising. But the picture that Fed researchers paint of Texas is eye-popping. Since 1990, the number of foreign-born people living there has jumped from 1.5 million to 4.3 million...”, and that “among large states, none has experienced a surge like Texas has, with immigrants rising from 9 per cent of the population in 1990 to 16.4 per cent in 2012”.
Some immigrants are highly skilled... But most are not: two-thirds do not have a high-school diploma, two-thirds come from Mexico, and almost half – or 1.8 million people – are illegal...
Here's a link to the report.