Wall Street's main indexes suffered their sharpest one-day declines in nearly six weeks on Wednesday after employment and manufacturing data suggested that the US-China trade war is taking an increasing toll on the US economy.

Adding to trade concerns, the United States won approval on Wednesday to levy import tariffs on $7.5 billion worth of European goods over illegal EU subsidies handed to Airbus , threatening to trigger a tit-for-tat transatlantic trade war.

All 11 major S&P sector indexes fell, with energy and financials each down more than 2 per cent. The ADP National Employment Report showed private payrolls growth in August was not as strong as previously estimated, and said “businesses have turned more cautious in their hiring,” with small enterprises becoming “especially hesitant.”

That added to fears sparked on Tuesday when a report showed US factory activity contracted to its lowest level in more than a decade. “The fact the manufacturing side of the economy in the US and globally is doing badly shouldn't come as a newsflash to anybody. But the extent of the miss yesterday is something that's driven this two-day move,” said Greg Boutle, head of US equity and derivative strategy at BNP Paribas.

The recent weak data has shaken investor faith in the strength of the domestic economy, which had shown relative resilience in the face of slowing global growth. Confidence in the US economy has helped support Wall Street this year. “If China buys less from us, we have less to manufacture, fewer orders to fill. This data is indicating we are not immune to this trade dispute, that it's hurting us as well as China,” said Sam Stovall, chief investment strategist at CFRA Research.

The focus is now on the US Labor Department's more comprehensive jobs report on Friday for further clues on the health of the US economy.

The S&P 500 and the Dow slipped below their 100-day moving averages for the first time in about a month. Many investors believe that falling below such moving averages means the indexes are likely to fall further. The S&P 500 is now about 5 per cent below its all-time high hit in July after coming within striking distance of the mark two weeks ago. Over the past 12 months, the S&P 500 is down about 1 per cent.

The Dow Jones Industrial Average dropped 1.86 per cent to end at 26,078.62 points, while the S&P 500 lost 1.79 per cent to 2,887.61. The Nasdaq Composite fell 1.56 per cent to 7,785.25. Volume on US exchanges was 8.0 billion shares, compared with the 7.3 billion average for the full session over the last 20 trading days.

The Cboe Volatility Index, or VIX, an options-based gauge of investor anxiety, rose 1.9 points to 20.47, its highest in about a month. Activision Blizzard Inc dropped 1.2 per cent after Bernstein downgraded the videogame maker's shares to “market perform.”

Ford Motor Co shares fell 3.3 per cent after the carmaker reported a fall of about 5 per cent in US auto sales for the third quarter. General Motors Co slumped 4.0 per cent after its quarterly sales came in slightly short of US car shopping website Edmunds' forecast.

Among bright spots, homebuilder Lennar Corp rose 3.8 per cent after the company reported a better-than-expected profit as cheaper mortgage rates led to higher demand for its homes. Johnson & Johnson gained 1.5 per cent after the drugmaker said it will pay $20 million to settle claims by two Ohio counties, allowing it to avoid an upcoming federal trial seeking to hold the industry responsible for the nation's opioid epidemic.

Declining issues outnumbered advancing ones on the NYSE by a 3.56-to-1 ratio; on Nasdaq, a 2.75-to-1 ratio favored decliners. The S&P 500 posted three new 52-week highs and 13 new lows; the Nasdaq Composite recorded four new highs and 182 new lows.

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