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DOHA, Qatar (AP) — Defense Secretary Chuck Hagel has ordered the U.S. military to transport troops from Burundi into the Central African Republic to help quell the latest upsurge in violence there.

Hagel approved the order after speaking with French Minister of Defense Jean-Yves Le Drian Monday night from Afghanistan where he was visiting troops. Le Drian asked the U.S. to help get African troops quickly into the country to prevent the violence there from spreading, said Pentagon spokesman Carl Woog.

There are more than 1,000 French troops in the Central African Republic, where Christian armed fighters launched an attack on the capital last week that killed about 400 people. The fighters oppose the Muslim ex-rebels now in charge of the former French colony.

Woog said Hagel directed the U.S. Africa Command to begin transporting forces in coordination with France because the U.S. believes immediate action is needed to avert a humanitarian catastrophe. And he said the Pentagon will be evaluating what other U.S. resources might be available if additional requests for assistance come in.

The transport flights are expected to begin in a day or two, according to a senior defense official who was not authorized to speak by name about the planning and thus requested anonymity. The official said there would be no other U.S. troops on the ground except any air crew needed for the flights into the Central African Republic.

WASHINGTON (AP) — Fully 20 percent of U.S. adults become rich for parts of their lives, wielding extensive influence over America's economy and politics, according to new survey data.

These "new rich," made up largely of older professionals, working married couples and more educated singles, are becoming politically influential, and economists say their capacity to spend is key to the U.S. economic recovery. But their rise is also a sign of the nation's continuing economic polarization.

They extend well beyond the wealthiest 1 percent, a traditional group of super-rich millionaires and billionaires with long-held family assets. The new rich have household income of $250,000 or more at some point during their working lives, putting them — if sometimes temporarily — in the top 2 percent of earners.

The new survey data on the affluent are being published in an upcoming book, and an analysis by The AP-NORC Center for Public Affairs Research provided additional information on the views of the group.

In a country where poverty is at a record high, today's new rich are notable for their sense of economic fragility. They rely on income from their work to maintain their social position and pay for things such as private tutoring for their children. That makes them much more fiscally conservative than other Americans, polling suggests, and less likely to support public programs, such as food stamps or early public education, to help the disadvantaged.

Last week, President Barack Obama asserted that growing inequality is "the defining challenge of our time," signaling that it will be a major theme for Democrats in next year's elections.

"In this country, you don't get anywhere without working hard," said James Lott, 28, a pharmacist in Renton, Wash., who adds to his six-figure salary by day-trading stocks. The son of Nigerian immigrants, Lott says he was able to get ahead by earning an advanced pharmacy degree. He makes nearly $200,000 a year.

After growing up on food stamps, Lott now splurges occasionally on nicer restaurants, Hugo Boss shoes and extended vacations to New Orleans, Atlanta and parts of Latin America. He believes government should play a role in helping the disadvantaged. But he says the poor should be encouraged to support themselves, explaining that his single mother rose out of hardship by starting a day-care business in their home.

The new research suggests that affluent Americans are more numerous than government data depict, encompassing 21 percent of working-age adults for at least a year by the time they turn 60. That proportion has more than doubled since 1979.

Even outside periods of unusual wealth, members of this group generally hover in the $100,000-plus income range, keeping them in the top 20 percent of earners.

At the same time, an increasing polarization of low-wage work and high-skill jobs has left middle-income careers depleted.

"For many in this group, the American dream is not dead. They have reached affluence for parts of their lives and see it as very attainable, even if the dream has become more elusive for everyone else," says Mark Rank, a professor at Washington University in St. Louis, who calculated numbers on the affluent for a forthcoming book, "Chasing the American Dream," to be published by the Oxford University Press.

As the fastest-growing group based on take-home pay, the new rich tend to enjoy better schools, employment and gated communities, making it easier to pass on their privilege to their children.

Because their rising status comes at a time when upward mobility in the U.S. ranks lowest among wealthy industrialized counties, the spending attitudes of the new rich have implications for politics and policy. It's now become even harder for people at the bottom to move up.

The group is more liberal than lower-income groups on issues such as abortion and gay marriage, according to an analysis of General Social Survey data by the AP-NORC Center for Public Affairs Research. But when it comes to money, their views aren't so open. They're wary of any government role in closing the income gap.

In Gallup polling in October, 60 percent of people making $90,000 or more said average Americans already had "plenty of opportunity" to get ahead. Among those making less than $48,000, the share was 48 percent

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Sometimes referred to by marketers as the "mass affluent," the new rich make up roughly 25 million U.S. households and account for nearly 40 percent of total U.S. consumer spending.

While paychecks shrank for most Americans after the 2007-2009 recession, theirs held steady or edged higher. In 2012, the top 20 percent of U.S. households took home a record 51 percent of the nation's income. The median income of this group is more than $150,000.

Once concentrated in the old-money enclaves of the Northeast, the new rich are now spread across the U.S., mostly in bigger cities and their suburbs. They include Washington, D.C.; Boston, Los Angeles, New York, San Francisco and Seattle. By race, whites are three times more likely to reach affluence than nonwhites.

Paul F. Nunes, managing director at Accenture's Institute for High Performance and Research, calls this group "the new power brokers of consumption." Because they spend just 60 percent of their before-tax income, often setting the rest aside for retirement or investing, he says their capacity to spend more will be important to a U.S. economic recovery.

In Miami, developers are betting on a growing luxury market, building higher-end malls featuring Cartier, Armani and Louis Vuitton and hoping to expand on South Florida's Bal Harbour, a favored hideaway of the rich.

"It's not that I don't have money. It's more like I don't have time," said Deborah Sponder, 57, walking her dog Ava recently along Miami's blossoming Design District. She was headed to one of her two art galleries — this one between the Emilio Pucci and Cartier stores and close to the Louis Vuitton and Hermes storefronts.

But Sponder says she doesn't consider her income of $250,000 as upper class, noting that she is paying college tuition for her three children. "Between rent, schooling and everything — it comes in and goes out."

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Both Democrats and Republicans are awakening to the political realities presented by this new demographic bubble.

Traditionally Republican, the group makes up more than 1 in 4 voters and is now more politically divided, better educated and less white and male than in the past, according to Election Day exit polls dating to the 1970s.

Sixty-nine percent of upper-income voters backed Republican Ronald Reagan and his supply-side economics of tax cuts in 1984. By 2008, Democrat Barack Obama had split their vote evenly, 49-49.

In 2012, Obama lost the group, with 54 percent backing Republican Mitt Romney.

"For the Democrats' part, traditional economic populism is poorly suited for affluent professionals," says Alan Abramowitz, an Emory University professor who specializes in political polarization.

The new rich includes Robert Kane, 39, of Colorado Springs, Colo.

A former stockbroker who once owned three houses and voted steadfastly Republican, Kane says he was humbled after the 2008 financial meltdown, which he says exposed Wall Street's excesses. Now a senior vice president for a private equity firm specializing in the marijuana business, Kane says he's concerned about upward mobility for the poor and calls wealthy politicians such as Romney "out of touch."

But Kane, now a registered independent, draws the line when it comes to higher taxes. "A dollar is best in your hand rather than the government's," he says.

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Associated Press Director of Polling Jennifer Agiesta, News Survey Specialist Dennis Junius, and writers Suzette Laboy in Miami and Kristen Wyatt in Denver contributed to this report.