U.S Population Hits 300 Million

TIJUANA, MEXICO - OCTOBER 17: Pedestrians pass the fortified border fences as they cross over the international border from Mexico (R) to the United States (L) on the morning that the US population hit the historic milestone of 300 million on October 17, 2006 in Tijuana, Mexico. The 300 millionth American, clocked in at 7:46 am according to the US Census Bureau, could have been an immigrant crossing the border, a newborn, or someone entering the US by air. US population growth has been greatly fueled the influx and higher birth rate of Latinos and other immigrants in recent decades. This border crossing from Tijuana to San Ysidro, California is the world's busiest border crossing. (Photo by David McNew/Getty Images)