Voters overwhelmingly chose Andres Manuel Lopez Obrador as Mexico's next president, embracing his leftist platforms and his criticism of US President Donald Trump.
Lopez Obrador, known by his initials "AMLO," will succeed President Enrique Peña Nieto on December 1.
He's vowed to tackle Mexico's most dire challenges -- poverty, violence and corruption -- while denouncing elitism and welcoming populism to the country's highest office.
But internationally, many will be watching how AMLO's respectful but contentious attitude toward Trump will play out.
When it comes to AMLO's thoughts about Trump's proposed border wall, the title of his recent book says it all:
"Listen, Trump! Saying Yes to a New Start for Mexico, Saying No to a Wall," the cover reads, featuring an image of AMLO lecturing and pointing his finger.
In a speech to his supporters, AMLO said he would forge a new relationship with the US "rooted in mutual respect and in defense of our migrant countrymen who work and live honestly in that country."
He said migration should be done by choice, not because of necessity, saying Mexico needs to "strengthen the internal market to try to produce in the country what we consume and so that Mexicans can work and be happy where they were born, where their family is, where their customs and their cultures are."
After AMLO's victory, Trump tweeted his congratulations and said he looked forward to working with the President-elect.
"There is much to be done that will benefit both the United States and Mexico," Trump said.
Breaking free from the 'power mafia'
AMLO ran on a populist platform, saying he's sick of the grip that Mexico's elite -- or "power mafia" -- have on the country.
So he's vowed to lower the salaries of top officials and give those in the bottom ranks a pay increase. He also promised to sell presidential planes and turn the presidential palace into a public park.
Voter Dario Manuel Lopez Pineda's said AMLO, the former mayor of Mexico City, has a strong track record of helping ordinary citizens.
"He was the first to give universal pension to seniors. He created 16 high schools in marginal areas," Lopez Pineda said.
"He created such seemingly insignificant things such as permanent driver licenses so that the government would not keep taking money from the people."
Ousting corruption and fighting violence
In Mexico City, voter Maria del Carmen Munoz said she supported AMLO during his two previous presidential campaigns.
"The third time (was) the charm," she said. "I have supported him for so long because I believe in him, because the government we have is rotten."
Lopez Obrador said the country's infamous corruption was the "result of a political regime in decay."
"We are absolutely certain that this evil is the principle cause of social inequality and of economic inequality," he said. "Because of corruption, violence has erupted in our country."
He said he will work with representatives of the United Nations, human rights groups and religious organizations to help tackle the murder rate, which soared to an all-time high under Peña Nieto's tenure.
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