Miguel Díaz-Canel spoke to crowds in Havana the US is attempting to break down Cuba’s political system.
He announced Washington wants full control across the island.
Díaz-Canel described American policies a form of political genocide during July 26 events.
He warned this is a danger to the country's sovereignty.
Raúl Castro was absent from the largest rally.
Tensions stay high because of sanctions and US political pressure.