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Who’s the 300 Millionth?

Newborn Marla Perez was born minutes after the official U.S. population estimate hit 300 million. (Richard Hartog / LAT)
Valerio Mayte Perez yawns a few hours after her birth, on the day America’s official population passed the 300-million mark. (Nick Ut / AP)
Sonia Bosque photographs her baby girl Genesis, born the day the U.S. Census Bureau estimated U.S. population at 300 million. (Roberto Schmidt / AFP/Getty Images)
Anareli Meza, held here by her mother Catalina Meza, entered the world at 5:10 a.m. — 24 minutes after the moment the Census Bureau had estimated the United States population would reach 300 million. (Robyn Beck / AFP/Getty Images)
The focus was on newborns, but the 300-millionth American could just as easily be an immigrant. Pedestrians pass fortified border fences as they cross from Mexico to the United States. (David McNew / Getty Images)
Cars queue up Tuesday to go from Tijuana, Mexico, to San Ysidro, California, at the world’s busiest border crossing. (David McNew / Getty Images)
Pedestrians cross the border from Mexico to the U.S. on the morning the official U.S. population estimate hit 300 million. (David McNew / Getty Images)
U.S. Census Bureau employees in Suitland, Md., clap Tuesday morning for the estimated 300-millionth American. (Mark Wilson / Getty Images)
A display of the national population estimate at the U.S. Census Bureau in Suitland, Md., hits 300,000,000 Tuesday morning. (AP / APTV)