The answer to the question is C
Answer: In 1917, Germany, determined to win its war of attrition against the Allies, announced the resumption of unrestricted warfare in war-zone waters. Three days later, the United States broke diplomatic relations with Germany, and just hours after that the American liner Housatonic was sunk by a German U-boat.
On April 17, 1961, 1400 Cuban exiles launched what became a botched invasion at the Bay of Pigs on the south coast of Cuba.
In 1959, Fidel Castro came to power in an armed revolt that overthrew Cuban dictator Fulgencio Batista. The US government distrusted Castro and was wary of his relationship with Nikita Khrushchev, the leader of the Soviet Union.
Before his inauguration, John F. Kennedy was briefed on a plan by the Central Intelligence Agency (CIA) developed during the Eisenhower administration to train Cuban exiles for an invasion of their homeland. The plan anticipated that the Cuban people and elements of the Cuban military would support the invasion. The ultimate goal was the overthrow of Castro and the establishment of a non-communist government friendly to the United States.
the columbian exchange introduced the Europeans and people in the Americas new types of crops, such as potatoes, sweet potatoes and cassava
