>>385783Because he wasn't.
Fidel is based af but we have to be honest about things, the Fidel Castro that fought in Sierra Maestra against Batista wasn't a commie (Raul and Che were though) he seemed to be a liberal with succdem reforms, and he wasn't even going to be president, but leader of the military.
It was only after he got cozy with the USSR and ordered US refineries in Cuba to process Soviet oil instead of American that the US barked at the idea, and Castro said "Fuck it" and started nationalizing US companies, like the United Fruit Company.
It was then that the US started plotting against Castro and launched Bay Of Pigs, and during the speech* Castro openly declared the Cuban Revolution a socialist revolution, surprising and confusing a lot of people that would later join the anticommunist bandits.
The first constitution that declared Cuba a socialist state was made as late as 1975.
*Embed, the speech.