Well, I rather disagree with the diagnosis:

Unbridgeable divisions have been at the heart of Argentina’s lowered
expectations. City dwellers, countryside peasants, capitalists, civil
servants and workers were never reconciled to the belief that they had
compatible interests. Truly, there is no guarantee of economic success
without intelligent statecraft.

I take rather the opposite view, that statecraft can screw things up but rarely do much to improve things. Possible negative effects, yes, but rarely positive ones, it being rather the absence of attempted statecraft which allows places to prosper (rather like Hong Kong for example).

Still, this is worth remembering:

The evidence was compelling. Argentina had a land mass the size of
continental Europe. Rising majestically in Swedish granite, Buenos
Aires had become the second-greatest city on the Atlantic seaboard.
Only New York was more important. Today China and India may be closing
the gap with Europe, but 90 years ago Argentina was surpassing the old
world. Its income per capita equalled that of Germany and was higher
than Sweden or Switzerland.

That happened off the back of the first great wave of globalization, free trade and the new freezer ships and canning techniques meaning that Argentine beef could flood into Europe. Post WWI we had all sorts of economic idiocies and tarrifs….even now they face barriers in the form of CAP and the EU. The best thing we can do for such places is get rid of our own restrictions on what they may sell us to, in fact rather than rhetoric, embrace unilateral free trade.