That is the title of a new paper by Jakob B. Madsen and Stojanka Andric, here is the abstract:
Using annual data from 1850 to 2010 for Argentina, Australia, Brazil, Canada, New Zealand, and the USA, this paper examines the impact of immigration and the immigrants’ educational and cultural background on unemployment. Instruments for 27 emigrating countries are used to deal with the feedback effects from unemployment to immigration. The results show that educated immigrants, in particular, and immigrants from Protestant countries significantly reduce unemployment, while poorly educated and non-Protestant immigrants enhance unemployment.
For the pointer I thank the excellent Kevin Lewis.