Miguel Díaz-Canel told crowds in Havana the US is attempting to break down Cuba’s political system.
He announced Washington wants complete control across the nation.
Díaz-Canel branded American policies a type of political genocide during July 26 events.
He warned this is a menace to the country's sovereignty.
Raúl Castro was absent from the main rally.
Tensions stay high as a result of sanctions and US political pressure.