The number of immigrants in the U.S. has tripled since 1970.
Immigration is the single largest factor in America's population growth.
The 8.6 million immigrants who arrived between 1990 and 1998 represent 42 percent of the 20.4 million increase in the U.S. population. During the same time, 5.4 million children were born to immigrant women. Thus, immigration and births to immigrant women equal 70 percent of the increase of the total U.S. population. Immigration has flooded the labor market with unskilled workers. The poverty rate for immigrants is 50 percent higher than for natives.