Hundreds of thousands of Cubans on Thursday attended the May Day rally here in Revolution Square. President Raul Castro led the rally amid a wave of social and economic changes in the Americas' only communist country. "Let us ratify our decision to continue on the path set out by the founder of the Cuban Revolution, Comrade Fidel (Castro)," said Salvador Valdes, leader of the lone Workers' Union as Raul Castro sat listening in his four-star general's military uniform.