The Muzies and Mexicans are breeding like rabbits.
The Mexican birthrate has fallen from 6 kids per woman to 2 kids per woman. Funnily enough (not) they tend to have 3 kids in the U.S. The muslim birthrate is also falling, though not nearly fast enough for me.
This holds true for Mexicans, not necessarily other Central American and South American immigrants. Honduras TFR = 2.5, Nicaragua = 2.4.
"Replacement" is 2.1.