From the history section of that page:
In 1930, Yrigoyen was ousted from power by the military led by José Félix Uriburu. Although Argentina remained among the fifteen richest countries until mid-century, this coup d’état marks the start of the steady economic and social decline that pushed the country back into underdevelopment.
It sucks that mercator became the standard map. I know basically nothing about maps, but i know how not-great mercator is. Of the little i know about cartography I like Winkel Tripel the best