You might want to go take a puff of whatever it is you are on ^^.
I am sure Canada thanks you for thinking they are so powerful but the UK, Europe and the rest of the world have had relations with Cuba for the past 50 years. One of our good friends in the UK encouraged us to go on vacation in Cuba a few years ago but my security clearance would not look so kindly at that trip and we could not go. It is the simplistic view that Republicans have used and again demonstrates you either have little interest in history or no ability to comprehend it.
The US relationship with Cuba goes back to the Spanish American War when business interests pushed America into a conflict with Spain in an effort to preserve and expand their interests in the Philippines and Cuba. Following the "war", Cuba became a protectorate before gaining its independence.
Fulgencio Batista, who had served as the elected President of Cuba from 1940 to 1944, became President for the second time in March 1952, after seizing power in a military coup (backed by US interests -- so much for your democracy) and cancelling the 1952 elections. Although Batista had been a relative progressive during his first term, in the 1950s he proved far more dictatorial and indifferent to popular concerns. While Cuba remained plagued by high unemployment and limited water infrastructure, Batista antagonized the population by forming lucrative links to organized crime and allowing American companies to dominate the Cuban economy.
During his first term as President, Batista had been supported by the Communist Party of Cuba, but during his second term he became strongly "anti-communist," gaining him political and military support from the United States. Batista developed a powerful security infrastructure to silence political opponents. In the months following the March 1952 coup, Fidel Castro, then a young lawyer and activist, petitioned for the overthrow of Batista, whom he accused of corruption and tyranny. However, Castro's constitutional arguments were rejected by the Cuban courts. After deciding that the Cuban regime could not be replaced through legal means, Castro resolved to launch an armed revolution. To this end, he and his brother Raúl founded a paramilitary organization known as "The Movement", stockpiling weapons and recruiting around 1,200 followers from Havana's disgruntled working class by the end of 1952.
The US and business interests were appalled after industries were "Nationalized" by the Castro's when they overthrew the military dictatorship (kind of replaced one with the other).
The trade embargo was to specifically punish and bring down the regime; it's the same bullshit the Republicans and you want to spout about Iran now -- let's just put a little more of an embargo on them and we'll cause the regime to collapse. Well guess what; 50 years and the regime has now changed hands (brother to brother) and the only ones that have truly been hurt in all of it are the Cuban people. The Soviet Union did not collapse because of a trade embargo; it was showing them that a world actually existed outside their borders that was far from what was portrayed. Why do you think North Korea fights so hard to limit what that country's population can see or hear? Why do you think "Radio Free Europe" so succeeded?
I'm glad President Obama had the balls to stand up to the special interest (and Republican) pandering which was designed to keep the Cuban vote in Florida going Republican. Fortunately the next generation of Cuban youth have realized the failure of the embargo and the insanity of keeping the island isolated for 50 more years. The embargo and thought process led to the Vietnam war failures and tens of thousands of American lives were lost...for what?
I'm sure President Carter should have invaded Nicaragua like Bush did Iraq; look what a success and model that has been. Or better yet, let's look at our successes in Vietnam, Laos, Cambodia...
As for no other country going communist, I guess Venezuela isn't exactly communist -- it is worse with a dictator who happily thumbed his nose at America and was far more oppressive and influential in the hemisphere. Then again, he did have oil and we needed it. I do find it amazing that you aren't complaining about all the Cuban immigrants (all would be illegal by your standards) who got to America in regular boat lifts. They, too, speak Spanish but it must be more favorable to the Republicans.