Challenge: with a POD no earlier than 1816 make Argentina a world-class power along with the US, China, Russia, UK, France, Brazil, Australia, Canada, Germany, and Japan. Brazil is expendable if it means a greater Argentina. This powerful Argentina must also have a GDP of at least 1 trillion and be in the top 10 military powers. It would be better to be a nuclear power, but it's not necessary.
So, what would happen for this Argentina to exist?