The two men have worked together before

At a relaxed outdoor news conference in shirtsleeves and open collars, Mr Fox said the fact that Mr Bush had chosen to Mexico for his first trip was a "clear message".

"This starting point is very encouraging so that Mexicans and Americans together can inaugurate an era of shared prosperity together," he said.

Drugs war

Mr Vicente welcomed Mr Bush at Bajio International Airport in the central state of Guanajuato, for a one-day summit on Friday. The two leaders exchanged a handshake and quick hug.

He's the kind of man you can look in the eye and know he's shooting straight with you

Bush, on Fox

Mr Bush made small talk in Spanish and then the two presidents retired to private meetings at the Mexican president's ranch.

Mr Bush said they spent a lot of time talking about how best to share energy resources and the possibility of energy exploration in Canada, the United States and Mexico.

Secretary of State Colin Powell joined Mr Bush

The two men also discussed the war against illegal drugs.

Mr Bush said he trusted Mr Fox when he said he was committed to an all-out fight against drug traffickers.

"He's the kind of man you can look in the eye and know he's shooting straight with you," said Mr Bush.

But he said the US was responsible for creating the demand that drives the drug trade.

"United States citizens use drugs," he said. "And our nation must do a better job of educating our citizenry about the dangers and evils of drug use."

Friendship

A few dozen Mexicans who live in the United States held a protest march in San Cristobal to demand amnesty for illegal immigrants, but they were turned back and kept away until the presidents left.

"We're here because we want help in working legally in the United States, because we suffer a lot on the way up," said migrant Ezequiel Martinez, who has crossed the border for seasonal farm work since the 1970s.

Correspondents say the trip was also a way for the two leaders to cement their relationship.

Both men are newcomers to office - President Fox assumed one month before Mr Bush - but they have worked together before, when Mr Bush was state governor of Texas.

They also share a fondness for cowboy boots and Stetson hats. On Friday Mr Bush wore black cowboy boots and a large silver belt buckle.

Mr Bush campaigned hard to win US Hispanic votes in last year's presidential election. During the campaign, he said America's relationship with Mexico and Latin America was one of his priorities.

Mexico has developed into a stronger economic player since the North American Free Trade Agreement was signed in 1994.