Miguel Díaz-Canel addressed crowds in Havana the US is trying to break down Cuba’s political system.
He announced Washington wants total control across Cuba.
Díaz-Canel branded American policies a type of political genocide during July 26 events.
He stressed this is a threat to the country's right to govern.
Raúl Castro was absent from the main rally.
Tensions are elevated as a result of sanctions and US political pressure.