[Jack Hydrazine]

The US’s fertility rate is 1.89 which less than replacement levels (2.1) so how can it get to over 400 million by 2060?

World population is only growing at 1.1% annually, but even that number will soon go negative.

[Resolute Conservative]

Not to mention the die off from some plague that is tacitly supported by our government or economic collapse event all set up to thin the herd.

[Buckeye McFrog]

World population is only growing at 1.1% annually, but even that number will soon go negative.

Which won't stop the world climate change alarmists from screaming repeated warnings about a world population of 12 billion in this century.

[Mrs. Don-o]

10% of U.S. population growth as a whole is due to immigrants and the first generation children of immigrans.

[kabar]

According to the CIA World Fact Book, the current fertility rate of the US is 2.01 children born/woman (2014 est.)

Immigration contributes to 80% of our population growth.

[tbw2]

Adding a million legal immigrants a year plus illegal ones.