APR wrote:

Michael, The US population in 1850 was around 22 million, it is now 280
million. This is a greater percentage then what you were proposing for
China. Look at the following graph http://www.npg.org/historypop.html


Actually, our governmetn undercounts at least 15 million-20 million
illegal immigrants. The actual population in the U.S. currently
ia roughly 320 million, with about 25 million of that not on the
official government tally.