By The Associated Press

GUADALAJARA, Mexico - President Barack Obama has joined the leaders of Mexico and Canada in pledging a united effort on economic recovery, trade, swine flu and climate change.

A statement from the leaders Monday says their nations are offering a "joint, responsible and transparent" response to the spreading swine flu threat.

They spoke at the end of a swift North American Leaders' Summit, an annual gathering launched during George W. Bush's presidency. The gathering typically yields fresh promises of co-ordination on many issues but no breakthroughs or initiatives.

Obama joined Mexican President Felipe Calderon and Canadian Prime Minister Stephen Harper for a news conference after about two hours of talks. Obama arrived Sunday night and was spending less than 24 hours in Mexico.