Miguel Díaz-Canel told crowds in Havana the US is trying to break down Cuba’s political system.
He announced America aims for total control over the island.
Díaz-Canel called American policies a type of political genocide during July 26 events.
He warned this is a menace to the country's right to govern.
Raúl Castro stayed away from the main rally.
Tensions stay high due to sanctions and American political pressure.