Let's use our critical thinking skills to extrapolate from what they are allowing us.
I wonder how many Juan Valdez' will vote in November ?
US (citizen) birthrates may be low(er), but births per se within the USA are up.
Your information is incorrect. First, the government does not distinguish the country of origin of mothers so the data you are citing does not exist.
As you can see that the actual number of births continues to decline With small bumps in 2021 and 2022 and is on pace to decline in 2024.
2024 — 575,272 — (January & February) Annualized to 3,451,632
2023 — 3,595,298
2022 — 3,667,758
2021 — 3,664,292
2020 — 3,613,647
2019 — 3,747,540
2018 — 3,791,712
2017 — 3,855,500
2016 — 3,945,875
2015 — 3,978,497
2014 — 3,988,076
The number of potential births has already been set for 2024. The conceptions taking place are for the 2025 numbers (except for premature births).
So in just ten years the number of births is down by a half a million.