I think that the main reason why it’s so low lately is because Trump is increasing security at the border and deporting more illegals.
No, it’s addressing replacement birthrates.
The Western nations and Japan are not creating replacement children.
Third worlders are procreating like there’s no tomorrow.
“Trump is increasing security at the border and deporting more illegals.”
Although that helps, another big reason is that the post WWII Baby Boom generaton is starting to die off.