Why would President Kennedy say that Cuba is an "imprisioned" island ?

He said that because Cuba was ruled by a communist government led by Comandante Fidel Castro. In the early 1960s, the Cuban revolutionary government (it had expelled USA-backed dictator Fulgencio Batista from power) nationalized numerous foreign properties and assests, many of them belonging to US companies, without indemnization.

The US government started a trade and economic embargo against the Cuban state as a reaction. After the CIA-sponsored Bay Pigs failed invasion of 1961, the Castro government became even more radical, declaring the Cuban Revolution a Communist revolution and getting close to the Soviet Union, which announced it would buy all the Cuban sugar the US had stopped importing.

Explanation:

john smith was the first englishman to sail around the world. francis bacon served as attorney general and lord chancellor of england. he took up aristotelian ideas, arguing for an empirical, inductive approach, known as the scientific method, which is the foundation of modern scientific inquiry.