More than eight million Cubans are registered to vote in a referendum the government has turned into a plebiscite on the "irrevocable" role of socialism in the island nation.
Cuba's presidential designate Miguel Diaz-Canel is an enigma. It is the first time since the 1959 revolution that a Castro brother has not occupied Cuba's top office.
President Donald Trump will announce curbs on US firms doing business with the Cuban military and tighter rules on travel to the island. Many Cubans are already crestfallen at the setback in detente even before it becomes official.
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