'The world came as close as it has ever come to total nuclear destruction on October 14 in 1962, when
photographs taken by an American U-2 spy plane offered definitive proof that the Soviet Union had set up missile
bases on the island nation of Cuba, a mere 90 miles from the American coastline.
In the above sentence,I wonder why "it has" not "it had"...?
Thirteen Days: "A dramatization of President Kennedy's administration's struggle to contain the Cuban Missile Crisis in October of 1962."