The two conflicts with cuba in the 1960s were:
When Fidel Castro came to power in 1959, relations between the two countries quickly devolved into bitter arguments, political grandstanding and the occasional international crisis. And while Cuba lies less than 100 miles (160 km) off the coast of Florida, the two nations have had no diplomatic relations since 1961 and use Switzerland as a mediator whenever they need to talk. But maybe — finally — things might change. On April 13 President Barack Obama announced that he would lift some longstanding restrictions, allowing Cuban Americans to visit and send remittances to their families and easing — but not removing — the 47-year-old economic embargo on the island nation. (Read "Will Obama Open Up All U.S. Travel to Cuba?")
But the U.S. and Cuba's ties go back well before Castro. In 1898, at the end of the Spanish-American war, a defeated Spain signed the rights to its territories — including Cuba, Puerto Rico and Guam — over to the U.S., which subsequently granted Cuba its independence with the stipulation that the U.S. could intervene in the country's affairs if necessary (later relinquished) and that it be granted a perpetual lease on its naval base at Guantánamo Bay (not). For the next half-century the two countries more or less cooperated, with the U.S. helping to squash rebellions and heavily investing in the economy of its tiny neighbor. The American mafia used Havana as a conference center in 1946. Ernest Hemingway lived there for 22 years; he wrote The Old Man and the Sea at his villa just outside the capital.
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here is a long answer
Change champions are individuals within an organization that volunteer or are selected to facilitate change. The champion is an active member within the change management project during all of its stages (Thompson, Estabrooks & Degner, 2004).
Feudalism worked easy because it was a system that worked from top to bottom. At the top you had the King which provided money for the Nobility that provided troops and protection for the king. Then the Nobility would bestow the land to his knights that would give the land to the peasants and they owned the land and farmer on it. The knights would provide military service for food that they farmed.
