Final answer:The promise fulfilled in the summer of 1969 was the Apollo 11 moon landing, marking the first time humans walked on the Moon, achieving President Kennedy's goal.Explanation:The promise that was fulfilled in the summer of 1969 was the Apollo 11 moon landing. This historic event occurred on July 20, 1969, when American astronauts Neil Armstrong and Edwin 'Buzz' Aldrin became the first humans to land on the Moon and walk on its surface, thus fulfilling President John F. Kennedy's promise to send an American safely to the Moon before the end of the decade. Other significant events, such as the Civil Rights Act and the Voting Rights Act, were indeed pivotal in the history of the United States, but they were fulfilled earlier in the decade, primarily in 1964 and 1965, respectively. The Great Society was a set of domestic programs launched by President Lyndon B. Johnson, aimed at eliminating poverty and racial injustice, which included the aforementioned acts but was not a singular promise made with a clear deadline like the lunar landing....

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