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FILE - In this May 10, 2019 file photo a container ship is loaded at the Virginia International Gateway terminal in Norfolk, Va. On Thursday, May 30, the Commerce Department issues the second estimate of how the U.S. economy performed in the January-March quarter. (AP Photo/Steve Helber, File)

The U.S. economy grew at a solid 3.1% annual rate in the January-March quarter - a pace that will likely prove to be the high-water mark for the year before growth weakens in the coming months.

That's the assessment widely shared by economists in light of the rising threats facing the U.S. economy, from a raging trade war to more cautious spending by consumers and businesses to a global slowdown. Their collective forecast is that last year's 2.9% growth - the fastest year of expansion since 2015 - will be followed by a more tepid 2.3% gain this year.

That pace would roughly match the average annual growth since the current expansion began in 2009. In two months, it will become the longest post-recession recovery on record. But it has also been the slowest since World War II.

Here are three key reasons why economists think growth has peaked for the year:

A pendulum swings back

Half the 3.1% growth rate in the January-March quarter that the government reported Thursday was due to two temporary factors: A surge in business efforts to restock shelves. And a big narrowing in the trade deficit.

In the calculations that produce the nation's gross domestic product, a widening trade deficit subtracts from growth. By contrast, a narrowing trade deficit, like the one last quarter, raises growth. Yet economists predict that the pendulum will swing back to a wider trade gap in the current April-June quarter.

Fading stimulus

President Donald Trump's signature domestic achievement was the passage of a $1.5 trillion tax cut in December 2017. Billions in additional spending for domestic and military programs that Congress approved in early 2018 also delivered a stimulative lift to the economy.

For households, tax cuts began showing up in paychecks early last year in the form of lower withholding amounts, leaving consumers with more money to spend. Consumer spending, which accounts for about two-thirds of economic activity, averaged a sizzling 3.3% annual rate over the final three quarters of 2018.

But the initial surge from the tax cuts and the increased government spending are waning now.

An ominous trade war

A return to a 2.3% growth rate, while slower than last year, would still likely leave the economy with enough steam to keep unemployment, already near a 50-year low, at a healthy level. What concerns economists is that some further shock might significantly slow growth.

Analysts are warily monitoring an array of risks, from disruptions resulting from a British exit from the European Union to weakening manufacturing and retail industries to jitters over congressional investigations into Trump's presidency.

But the gravest perceived threat may be the escalating trade war between the United States and China, the world's two largest economies. Stock markets have been falling since talks broke off this month and the Trump administration announced that it was boosting tariffs on $250 billion in Chinese goods. Beijing vowed to retaliate against U.S. products as it has done with previous Trump tariffs.

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