by Robert Malone, Brownstone Institute:

Worldwide birthrate per 1,000 people follows a very predictable trend. In “developed” and/or wealthy nations, the birthrate is low and in nations at the lower end of the economic development scale, the birthrate is high. Nothing new there.
Many countries, including the US, have birthrates that either are too low to sustain current population levels or are stable. Since 1970, the population of people born in the US has been stable at below 300 million. In fact, some estimates show a decline in population. All of the population growth in the US during this time period has been due to immigration. That is why the USA has grown to 336 million people in 50 years. This trend has only increased in recent years.