The Dow Jones industrial average gained less than a point, or 0.01%, to 13,250. The S&P 500 Index was flat at 1,414. The Nasdaq Composite rose 0.60 points, or 0.04%, to 3,062.
In the macroeconomic domain, US consumer confidence improved in August, with the Thomson-Reuters/University of Michigan consumer sentiment index rising to 73.6 from 72.3 at the end of July. Meanwhile, the Conference Board's index of leading indicators for July rose more than expected.
European markets traded higher, with the Stoxx Europe 600 up 0.5%, as sentiment was boosted by German Chancellor Angela Merkel's comments about her commitment to preserve the euro.
Gold dropped 0.2% to $1,615.90 an ounce, while crude-oil futures eased 0.3% to $95.33 a barrel.