"Today is a historic day," he said, "a new era."
Macri spoke shortly after Daniel Scioli, Argentine President Cristina Fernandez de Kirchner`s hand-picked successor, conceded defeat.
With more than 98% of votes counted, Macri of the Let`s Change coalition had won 51.4% of votes, while Scioli had garnered nearly 48.6%, elections officials said.
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