The Battle of the River Plate did not involve armed action by any South American country nor any South American citizens. The Graf Spee had sought anchorage in a neutral country's harbour (Uruguay & Montevideo). Under International Law they only had 24 hours (or they could surrender the ship & be interned for the rest of the war) but through 'negotiations' gained a maximum stay of 72 hours. The actual battle prior to entering the harbour involved Germans, British & Kiwis. Subsequently the Graf Spee was scuttled without a further shot fired mainly thanks to false information about what ships were waiting for the Graf Spee.
Of all of South America, only Brazil had active involvement sending troops.
Equally most of sub-Saharan Africa was relatively untouched by military action as Germany had lost all of its colonial holdings after WW1. Italy attacked from its holdings in the Horn of Africa with over 200,000 soldiers successfully (but stupidly as they could not get any re-supply). Italy made gains but as Allied troop numbers were built up from less than 30,000 troops, & well supplied - Italy lost all their gains and subsequently their entire holdings there.
For example the lack of parts saw their around 300 more modern aircraft (than the Allies had) quickly reduced to under 70 due to predominantly this lack of spares before ceasing to be operational completely.
There were hundreds of thousands of sub-Saharan Africans who fought for the Allies.
CV has been a totally different matter. Even as of yesterday - many South American countries are seeing far more cases per million/week & deaths per million/week than India.
Such as Uruguay, Argentina, Brazil, (even France)!
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