The slowdown followed two back-to-back quarters of bullish growth and is likely to be short-lived given the enormous tailwind from lower gasoline prices. Other data on Friday showed consumer sentiment jumped to an 11-year high in January.
"We look for strong domestic consumption to continue supporting growth momentum in the coming quarters even as INVESTMENT suffers due to falling oil prices," said Gennadiy Goldberg, an economist at TD Securities in New York.
Gross domestic product expanded at a 2.6 percent annual pace after the third quarter's spectacular 5 percent rate, the Commerce Department said in its first fourth-quarter GDP snapshot on Friday
Most economists believe fundamentals in the United States are strong enough to cushion the blow on growth from weakening overseas economies.
Even with the moderation in the fourth quarter, growth remained above a 2.5 percent pace, which is considered to be the economy's potential. Economists had expected GDP to expand at a 3 percent rate in the fourth quarter.
U.S. stocks were trading lower on the GDP report, while prices for U.S. Treasury debt rose. The dollar was largely unchanged against a basket of currencies.
For all of 2014, the economy grew 2.4 percent compared to 2.2 percent in 2013. The report came two days after the Federal Reserve said the economy was growing at a "solid pace," an upgraded assessment that keeps it on track to start raising interest rates this year.
The U.S. central bank has kept its short-term interest rate near zero since December 2008 and most economists expect a mid-year lift-off.
Consumer spending, which accounts for more than two-thirds of U.S. economic activity, advanced at a 4.3 percent pace in the fourth quarter - the fastest since the first quarter of 2006 and an acceleration from the third quarter's 3.2 percent pace.
Lower gasoline prices - they are down 43 percent since June, according to government data - and a strengthening labor market are fueling a surge in optimism among households. The University of Michigan's consumer sentiment rose to 98.1 this month, the best reading since January 2004, from 93.6 in December.
"The level of consumer sentiment supports our view that consumer spending will kick the year off on a robust foot after the drop in energy prices left consumers' wallets full," said Bricklin Dwyer, an economist at BNP Paribas in New York.
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