ORLANDO, Florida, May 1 (Reuters) - Net trade delivered

a record blow to the U.S. economy in the first quarter, as U.S.

companies ramped up imports to get ahead of the Trump

administration's tariff tsunami.

While the focus is rightly on imports, it's also worth

considering the export side of the ledger and the damage that

could be caused by retaliation to Trump's trade war.

Imports exploded 41.3% in the first quarter, causing a net

4.8 percentage point drag on growth. That was the largest since

records began in the 1940s.

Tariffs on imports make goods coming into the country more

expensive, which is why businesses gobbled up as many as they

could during the quarter in anticipation of Trump's levies.

While a repeat on this scale in the second quarter is

unlikely, imports are likely to remain a heavy drag on growth as

firms stock up before the new duties on imports kick in.

Exports also rose in the January-March period, but by an

unremarkable 1.8%. If history is any guide, that figure could

start shrinking because of retaliation in response to Trump's

tariff salvos.

While dozens of countries are trying to strike deals with

the U.S., that does not mean they will simply roll over,

especially if Washington plays hard ball. Many will retaliate in

kind, making U.S. goods more expensive and uncompetitive in the

international market.

The Trump administration may not fully appreciate this risk.

A 2021 working paper 'The Smoot-Hawley Trade War' by the

National Bureau of Economic Research noted that Peter Navarro,

then Director of Office of Trade and Manufacturing Policy and

now a senior counsel to Trump, predicted that no country would

retaliate against U.S. tariffs.

"The evidence from the 1930s suggests it is a mistake, even

for a country as wealthy and powerful as the United States, to

assume that it can engage in a trade war with impunity," the

paper concluded.

'CATASTROPHIC'

Of course, the world today is unrecognizable from that of

1930 when President Herbert Hoover signed into law the infamous

'Smoot-Hawley Tariff Act', which raised tariffs on thousands of

imports into the United States.

The manufacturing process today is global, complex and much

more sophisticated. Some 40% of U.S. imports are inputs used in

the production of other goods and services. Trade was a lot more

straightforward in the 1930s.

But this protectionist measure - which the U.S. Senate's

website describes as "among the most catastrophic acts in

congressional history" - is widely cited as a key contributor to

deepening the Great Depression, partly because many of America's

trading partners retaliated in kind and global trade nose-dived.

The NBER paper found that U.S. exports to countries that

'protested' the Smoot-Hawley import tariffs fell by 15-22%,

while exports to 'retaliators' plunged by 28-33%. And if we

focus on key exports, those from 'retaliators' and 'protesters',

in aggregate, fell by an average of 22.5% after Smoot-Hawley.

Canada was a particularly aggressive 'retaliator' in the

1930s. And nearly 100 years later, under the leadership of newly

elected Prime Minister Mark Carney, it could once again be among

the world's most spirited fighters in the trade war with

Washington.

Canada is the USA's number one export market, and goods

trade between the two countries last year totaled $762 billion.

The Canadian Chamber of Commerce estimates that 3.7 million jobs

across both nations are tied to that bilateral trade.

ELASTIC DEMAND

The U.S. is currently the world's second-largest global

exporter, but net exports usually subtract from growth because

the U.S. has run a trade deficit for the past 50 years. Last

year, goods exports totaled $2.1 trillion, and imports totaled

$3.3 trillion.

Trump believes his tariffs will slash the deficit, revive

U.S. industry, and bring back the manufacturing jobs that have

been lost over the decades. But if U.S. companies could produce

more cheaply at home, they would. And it takes years to set up

factories and production lines, so even if Trump's policies do

bear fruit, it won't be for a long time.

Once the dust settles and trade deals have been reached, the

levels of duties will probably have come down from what Trump is

currently threatening. But tariffs will likely still be the

highest in decades, and many countries will almost certainly

have reacted in kind, for political and economic reasons.

"Foreign demand is elastic, countries can substitute for

American goods. Our export growth will slow down," says

economist John Silvia.

So net exports will almost certainly remain a drag on growth

for some time to come. The only question is how big that drag

will be.

(The opinions expressed here are those of the author, a

columnist for Reuters.)

(By Jamie McGeever

Editing by Peter Graff)