Wall Street rose at the open on Tuesday as rising commodity prices and an uptick in merger and acquisition activity fueled hopes the economy is strengthening.

Kraft Foods Inc said it was intent on pursuing Britain's Cadbury Plc , which rejected a bid from the U.S. company.

The Dow Jones industrial average <.DJI> gained 63.78 points, or 0.68 percent, to 9,505.05. The Standard & Poor's 500 Index <.SPX> rose 9.31 points, or 0.92 percent, to 1,025.71. The Nasdaq Composite Index <.IXIC> added 19.36 points, or 0.96 percent, to 2,038.14.

(Reporting by Chuck Mikolajczak; editing by Jeffrey Benkoe)