On more than 30 occasions, the United Nations Assembly has discussed the blockade against Cuba, which costs the island 5 billion dollars annually, according to some estimates. Every year the resolution is proposed and the whole world, through the vote of the absolute majority of the member countries of the United Nations General Assembly, has condemned the imperialist attitude of the United States towards Cuba.
Yes, although having the ship is only part of it. What the diagram can’t really show is that the US also has a global logistics system which supplies the carriers and their accompanying battle groups when they deploy to other side of the planet. That system has been decades in the making, it’s not something you can just buy, it requires a crazy amount of planning and organization.
I doubt the US could deploy every carrier effectively, but it can certainly put multiple battle groups at sea simultaneously and keep them there for a long time.