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The day in numbers: 300 million

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(CNN) -- The population of the United States surpassed the 300 million mark on Tuesday, according to the U.S. Census Bureau. The U.S. is the only industrialized nation in the world whose population is rising substantially.

3: The United States has the world's third largest population after China and India, both of whose populations are also rising.

7: The average number of seconds between each birth in the U.S.

31: The average number of seconds between the arrival of each new migrant into the U.S.

34 million: The number of foreign-born people living in the U.S. in 2004 compared with just 9.7 million in 1967.

2043: The year the Census Bureau predicts the U.S. population will reach 400 million.

1.5 million: The number of people living now living in Phoenix, Arizona, compared with under half a million 40 years ago. The country has witnessed huge demographic changes, with a shift in population from the Northeast and Midwest to the West and South.

50 percent: Half of the U.S. population lives in suburbs compared with 38 per cent in the 1970s.

50 percent: The number of married couple households has fallen to 50 percent from 75 percent in 1967.

26 percent: The percentage of people who live alone as young people marry later and older people who are divorced or widowed don't remarry.

2.3kg: The amount of trash each American produces every day -- about five times more than a person in a developing country.

25 percent: The amount of the world's energy consumed by the U.S. The country is also the single largest emitter of carbon dioxide.

1,000: The number of plants and animals listed as endangered species because of loss of habitat due to land development.

3: The number of times more water each American uses than the world average. The U.S. has also lost half of its wetlands to urban development and agriculture.

Yailin Melissa Turcios born in Florida on the day the U.S. population reaches 300 million



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