The continuing refusal of Castro to allow his people to travel freely between his country and the United States.

Think you'd better take another refresher course; maybe start with Phil Och's "Ballad of William Worthy"?

The US still prohibits its citizens from travelling to Cuba, and not so many years back the list of countries us "free" Americans couldn't travel to was longer than your arm.

And the "Monroe Doctrine" (which was laughed at by the rest of the world when it was initially proposed as the empty bombast it was) has been most successfuly used by the US to justify the invasion and overthrow of the governments of various Central American and South American countries for the last 125 years or so. Not a precedent to take much pride in.

Best, Greg