Lopez Obrador has trodden carefully and wants to broker a deal with Trump under which Mexico would work to rein in illegal immigration in return for economic support. We have a border of more than 3,000 kilometres, more than 12 million Mexicans live in the United States.
Mexican presidents are limited by law to a single term. These are all factors that point to a stalemate, said Moshe Lander, an economist at Concordia University.
"We are not going to fight".
"I don't see how he's going to be able to find an agreement that's going to be acceptable to, now, a left-wing populist, a right-wing populist and our country who is claiming hurt feelings as a basis for negotiations".
Having lost twice before, the former Mexico City mayor, known by his initials Amlo, crushed his rivals and promised "profound change is coming". "I look very much forward to working with him", tweeted President Trump on Sunday evening before the leftist Obrador's vote count was projected to be around 53 percent.
Despite his affable approach towards Mexico's northern neighbor, Lopez Obrador's victory did little for the Peso.
Presidential candidate Andres Manuel Lopez Obrador waves to supporters as he arrives to Mexico City's main square, the Zocalo, Sunday, July 1, 2018.
Addressing the domestic challenges of Mexico, Lopez Obrador said eradicating corruption and impunity will be the primary mission of his government and he will "not fail" the Mexican people. "That is what brought us to this".
Both Moody's and Fitch Ratings said any adjustments of the country's risk profiles and debt ratings would depend on how Lopez Obrador's policies are ultimately implemented.
Mexicans also voted for members of both houses of Congress and nine governors. Lopez Obrador has vowed that "for the better of everyone, the poor come first", promising to help the least fortunate by increasing welfare benefits for old people and providing scholarships for needy students.
Once results showed his margin of victory on Sunday, and mindful of accusations that his instincts cleave toward authoritarianism, Lopez Obrador quickly sought to calm nerves about his presidency.
An exit poll in Mexico is giving a big edge to leftist presidential candidate Andres Manuel Lopez Obrador in his third bid for the presidency.
She said Lopez Obrador as mayor, and later during his first run as a presidential candidate in 2006, "never left anybody with an unshaken hand".
Lopez Obrador, meanwhile, said in an interview Monday he would speak with President Trump to try to "reach an understanding" on Trump's proposed border wall and other issues deeply dividing the two countries.
The president-in-waiting, whose term will begin December 1, devoted much of his speech to appealing to citizens of all stripes and seeking to reassure those who have eyed his candidacy nervously. But he's been frustratingly vague on how he'll go about it.
"If there is any change, I think it's going to be for the worse". "What are the signals that he sends out to markets, to his political opponents, to Mexican society generally, of what he'll actually do when he comes into office?" The talks have been stalled over the Trump administration demands for higher USA content and a "sunset clause" in the 1994 trade agreement.
With US encouragement, Mexico has gone to war against the cartels, imprisoning drug users and drug runners, incinerating opium and marijuana fields, and sending thousands of armed soldiers into the streets.