WASHINGTON — The minority population in the United States is steadily rising and now makes up 35 percent of the total, advancing an unmistakable trend that could render them the new American majority by midcentury.

New Census estimates show minorities added more than 2 percent in 2009 to 107.2 million people, boosted by a surge in Hispanic births and more people who described themselves as multiracial. During this time, the white population remained flat, making up roughly 199.9 million, or 65 percent, of the country.

In 2000, whites comprised 69 percent of the total population and minorities 31 percent.

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Currently four states — Hawaii, New Mexico, California and Texas — as well as the federal enclave of Washington have minority populations that exceeded 50 percent.

And it is one state more from 2000, when Texas had not yet become a minority state. The 35 percent overall minority proportion of the population was up from 34 percent a year ago.

The new Census estimates released Thursday documented a widening age and race divide. They also are the last government numbers before completion of the 2010 census later this year, which could change the balance of political power when legislative districts are redrawn based on population and racial diversity.

The overall rise in the minority population is due to recent sharp increases in minority births, especially among Hispanics, who made up more than half of the total population gains last year. There are now roughly 9 births for every 1 death among the Latino population, compared to a roughly one-to-one ratio for whites.

As a result, even with immigration of Hispanics now slowing, U.S. minorities make up 49 percent of the children born in the U.S., up one percentage point from 2008. Based on current rates, data from the 2010 census could show a new “tipping point” in which babies born to minorities outnumber that of babies born to whites.

About 1 in 4 counties now have more minority children than white children or are nearing that point.

“Fertility is playing a critical role in reshaping the racial and ethnic structure of the country,” said Kenneth Johnson, a sociology professor at the University of New Hampshire.

Multiracial Americans, the fastest growing U.S. demographic group, are also adding to minority gains. About 5.3 million last year were identified as being of multiple race or ethnicity, up 3.2 percent from the previous year.

Among the individual races, Hispanics grew by 3.1 percent to 48.4 million and Asians increased 2.5 percent to 13.7 million. They now represent about 15.8 percent and 4.5 percent of the U.S. population, respectively.

Blacks, who make up about 12.3 percent of the population, increased less than 1 percent last year to 37.7 million.

“Most parts of the country are now totally dependent on minorities for achieving growth in their young adult and child populations,” said William H. Frey, a demographer at the Brookings Institution, citing the low birth rates among whites as well as the aging white baby boomer population.

“Minorities are especially important for current and future labor force gains in all but the most rapidly growing parts of the country,” he said.

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