The U.S. government Friday formally removed Cuba from a U.S. terrorism blacklist, a decision hailed in Cuba as the healing of a decades-old wound and an important step toward normalizing relations between the Cold War foes.

Secretary of State John Kerry signed off on rescinding Cuba's "state sponsor of terrorism" designation exactly 45 days after the Obama administration informed Congress of its intent to do so on April 14. Lawmakers had that amount of time to weigh in and try to block the move, but did not do so.

"While the United States has significant concerns and disagreements with a wide range of Cuba's policies and actions, these fall outside the criteria relevant to the rescission of a state sponsor of terrorism designation," the State Department said.

The step comes as officials from the two countries continue to hash out details of restoring full diplomatic relations, including opening embassies in Washington and Havana and returning ambassadors to the two countries for the first time since the U.S. severed diplomatic relations with the island in January 1961. The removal of Cuba from the terrorism list had been a key Cuban demand.

The Cold War-era designation was levied mainly for Cuba's support of leftist guerrillas in the region.