Gustavo Petro, a former rebel fighter, will become Colombia's first left-wing leader.
In a video posted to social media, Mr Hernandez, whoconceded to Mr Petro.
Mr Petro, a former member of the M-19 guerrilla movement, ran on a radical manifesto and pledged during the campaign to fight inequality by providing free university education, pension reforms and high taxes on unproductive land. In a country that experienced decades of civil conflict, Gustavo Petro's critics highlighted his role as a former rebel, arguing his economic plans would spell disaster for the country.For Ana Beatriz Acevedo, who represents displaced Afro-Colombian women, the election marks a major change for the country.
Now Colombia will have its first ever leftist leader and alongside him, the first ever black vice-president - and that speaks volumes about the desire for a different political path. But Mr Petro will face challenges from a fragmented congress, which includes representatives of more than a dozen parties.
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