I just received a very interesting issue of the FRBSF Economic Letter. The topic is The Effect of Immigrants on U.S. Employment and Productivity. I will state up front, it does nothing to provide a sound economic argument for those looking to restrict immigraion on the grounds of protecting American jobs. And quite frankly, I didn't think it would. If anything, it provides further support for an view put forth several years ago in this issue of the Federal Reserve Bank of St. Louis's The Regional Economist.
I would recommend either or both of these articles for use with your students provided they are reading at grade level. I would think they would make a good discussion starter for labor markets, factors of production, and production function and GDP, just to suggest a few. If you wouldn't mind, read them over and share your suggestions or thoughts.