US retail sales contracted in September for the first time in seven months, according to the Commerce Department, in a sign that cracks might be spreading from the manufacturing sector to the broader economy.

"The retail sales number has surprised people," said Peter Tuz, president of Chase Investment Counsel in Charlottesville, Virginia. "It's bringing up ideas that the economy might be slowing down."

Uncertainty over whether the United States and China could resolve their long-running trade dispute increased after the US House of Representatives riled Beijing by passing pro-democracy legislation in support of Hong Kong.

United Airlines advanced 2.6% after the airline beat quarterly profit estimates and increased its 2019 guidance.

The Dow Jones Industrial Average rose 18.19 points, or 0.07%, to 27,042.99, the S&P 500 lost 3.71 points, or 0.12%, to 2,991.97 and the Nasdaq Composite dropped 25.20 points, or 0.31%, to 8,123.51.

Of the 11 major sectors in the S&P 500, three were trading in negative territory, with energy and tech suffering the largest percentage losses.