John F. Kennedy's career was shaped by significant historical moments such as World War II, where he served in the Navy, and the Cold War, particularly the Cuban Missile Crisis. His experiences during these pivotal events informed his views on foreign policy and leadership. Additionally, the assassination of his brother, Robert Kennedy, and the broader context of the civil rights movement influenced his commitment to social change and political courage, culminating in his own untimely death, which further defined his legacy.