Miguel Díaz-Canel spoke to crowds in Havana the US is trying to break down Cuba’s political system.
He declared America aims for full control through the island.
Díaz-Canel described American policies a type of political genocide during July 26 events.
He emphasised this is a threat to Cuba’s right to govern.
Raúl Castro did not attend from the largest rally.
Tensions remain high because of sanctions and American political pressure.