Highlights twenty events that influenced the history of the United States, including the Louisiana Purchase, the building of the transcontinental railroad, the bombing of Pearl Harbor, and the Montgomery Bus Boycott.

Presents highlights of twenty battles which changed the modern world, including the three days at Gettysburg, the bombing of Guernica, the Tet offensive, and the Six-Day War.

Describes twenty famous disasters, from the eruption of Mount Vesuvius, to the sinking of the Titanic, to Hurricanes Andrew and Iniki.

Describes the events and people involved in the making of the atomic bomb.