A message is posted on the front window of the Ranging Bull Saloon which remains closed during the coronavirus pandemic,…
A message is posted on the front window of the Ranging Bull Saloon, which remains closed during the coronavirus pandemic, in Augusta, Maine, April 28, 2020.

The U.S. economy plunged at an annual rate of 4.8% in the first quarter as the coronavirus pandemic shut wide swaths of American industry and white-collar businesses in the country's biggest downturn in more than a decade, the Commerce Department said Wednesday. 

The impact was so pronounced that the decline for the January-to-March period occurred entirely in the last three weeks of March as the effect of the pandemic swept through the world's biggest economy. It forced the closure of major factories with thousands of workers, office complexes and mom-and-pop retail stores in cities large and small.

But the true economic impact of the pandemic won't be known for three months, when second-quarter statistics are released, because the brunt of the worker layoffs have occurred in April. Already, 26 million workers have lost their jobs, with millions more being added to the ranks of the unemployed each week.

Mohammad Ikram closes a large door to his business Hot Stop, fully stocked but closed during the coronavirus pandemic, on the boardwalk in Atlantic City, N.J., April 28, 2020.

The Federal Reserve, which has already cut interest rates to near zero, pledged at the end of its meeting in Washington to take whatever steps it could to rescue the U.S. economy. 

The central bank said it was committed to using its "full range of tools to support the U.S. economy in this challenging time. The ongoing public health crisis will weigh heavily on economic activity, employment and inflation in the near term, and poses considerable risks to the economic outlook over the medium term."

Fed Chair Jerome Powell told a news conference, “We’re seeing global data which is very, very negative.”

He said that as the central bank acts to boost the U.S. recovery, “we’re not going to be in any hurry to withdraw these measures. We want to get people back to work as fast as we can.”

FILE - Commerce Secretary Wilbur Ross speaks on Capitol Hill, March 10, 2020.

Commerce Secretary Wilbur Ross said the report on the country's gross domestic product was weak, "but in line with expectations" from the severe economic impact of the pandemic. 

"We continue to have the most resilient economy in the world," Ross said, "driven by innovative and hardworking Americans who have shown that they are willing to make the needed sacrifices to defeat this invisible enemy." 

He said massive financial outlays of trillions of dollars supported by Congress and President Donald Trump have established "a firm footing for a swift and strong American comeback. When this chapter ends, America will be both stronger and healthier than ever." 

The first-quarter plunge was the country's biggest since the Great Recession from 2007 to 2009. Economists are predicting the second-quarter drop could reach to as much as 30%. 

FILE - Treasury Secretary Steven Mnuchin speaks about the coronavirus at the White House, April 13, 2020.

A handful of state governors have gingerly started to ease work closures, telling barbershops, nail salons, restaurants and some stores they can reopen if they want to. The ensuing question is then whether customers are willing to venture into public to patronize the businesses or are too worried about the spread of the coronavirus, which as of Wednesday afternoon had already killed more than 60,200 Americans, according to Johns Hopkins University statistics.

Treasury Secretary Steven Mnuchin said this week that the economy should "really bounce back" this summer as states lift stay-at-home orders at the same time trillions of dollars in federal emergency spending flows through the U.S. economy. 

But most independent economists are much less optimistic. They are questioning when or whether the lost or diminished parts of the U.S. economy will recover.