The correct answer to this open question is the following.
Unfortunately, the map you attached is in black and white, not in color. So we do not see any red circles.
However, trying to help you we can say the following.
Some of those black and white circles show the range of the Soviet Union missiles in case they were fired.
We are talking about the series of missiles that the Soviet Union had on the Island of Cuba and which represented a major threat to many United States cities, as well as other regions of Canada, México, Central and South America.
We can say that the area of the United States that would have been hit the hardest had nuclear weapons been used during the Cuban Missile Crisis was Florida. It is so close to the Island of Cuba.
The Cuban Missile Crisis of October 1962, was one of the tensest moments between the Soviet Union and the United States. Indeed, this incident put the world on the brink of another world war.
