If he had some success he might moderate his stance ? How will the USSR see this ? ANy transatlantic support ? From India ? Nasser of Egypt the socalled Nonaligned countries ?
Growth of a more virulent form of fascism in South America ?
A particularly fascinating period in the whole Che saga was his brief years in Cuba after the overthrow of Batista.
Here was a man, an idealist, at the head of a successful communist guerrilla campaign in the US' back yard and now had power to create his island utopia.
He had a beautiful wife, growing family, and was a mega international celebrity.
And what did he did he do?
He freely gave it all up to live and fight in hellish jungles of Angola.
No way, no how would Che
ever moderate his ideals until ALL of the Third World was living under socialist rule.
His idealism is unmatched, and quite inspiring, but ultimately foolhardy. This is what caused his downfall in OTL and would in any ATL unless your going the Not-Ler route.
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In so far as your other questions, remember this was post detente USSR were talking here. A growing communist threat in South America would only threaten global stability and trade relations with the US i they openly supported it. Also Che was too left for even Khrushchev and certainly Brezhnev.
Other countries? maybe Nasser but again how much support could they supply from half way across the globe? Libya could hardly provide support in Angola and they were on the same continent.