It sounds like you're talking about 'immigration raising the population', which is slightly orthogonal to the grandparent post statement that birth rates tend t

It sounds like you're talking about 'immigration raising the population', which is slightly orthogonal to the grandparent post statement that birth rates tend to stabilize, but are higher than otherwise because of immigration. I assume what he was actually referring to was the tendency of first generation immigrants to have a higher birth rate than non-immigrants in America.