One point I find they are missing here is how conditions in origin countries greatly affect immigration. German emigration dropped abruptly due to Bismarck's cr

One point I find they are missing here is how conditions in origin countries greatly affect immigration. German emigration dropped abruptly due to Bismarck's creation of the social welfare state [1]. Recent improvements in the Mexican economy are a large factor in the decline of Mexican immigration [2]. 1. https://en.wikipedia.org/wiki/Otto_von_Bismarck#Early_legislation https://en.wikipedia.org/wiki/Otto_von_Bismarck#Early_legisl... 2. https://en.wikipedia.org/wiki/Emigration_from_Mexico#Recent_trend_reversal_in_migration_Mexico-U.S https://en.wikipedia.org/wiki/Emigration_from_Mexico#Recent_....