2.1 is the population replacement rate. The U.S. as a whole is about 1.63, above, but 1.78 by others’ estimates. Some states, like mine, are just 1.39. This means any population growth we see is from internal moves from states within the U.S., or immigration from abroad.

Source: List of U.S. states and territories by fertility rate – Wikipedia

Coldstreams Skeptic