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- What was the Alamo?, by Pam Pollack and Meg Belviso ; illustrated by David Groff
- What are castles and knights?, by Sarah Fabiny ; illustrated by Dede Putra
- What was the age of the dinosaurs?, by Megan Stine ; illustrated by Gregory Copeland
- What were the roaring twenties?, by Michele Mortlock ; illustrated by Jake Murray
- What was the Wild West?, by Janet B. Pascal ; illustrated by Stephen Marchesi
- What was Pearl Harbor?, by Patricia Brennan Demuth ; illustrated by John Mantha
- What is LEGO?, by Jim O'Connor ; illustrated by Ted Hammond
- What were the Negro Leagues?, by Varian Johnson ; illustrated by Stephen Marchesi
- What was the Donner Party?, by Ben Hubbard ; illustrated by Tim Foley
- What was the San Francisco Earthquake?, by Dorothy and Thomas Hoobler ; illustrated by Ted Hammond
- What was the Berlin Wall?, by Nico Medina ; illustrated by Stephen Marchesi
- What was Hurricane Katrina?, by Robin Koontz ; illustrated by John Hinderliter
- What was the Holocaust?, by Gail Herman ; illustrated by Jerry Hoare
- What was the Great Depression?, by Janet B. Pascal ; illustrated by Dede Putra
- What was the Great Molasses Flood of 1919?, by Kirsten Anderson ; illustrated by Dede Putra
- What were the Salem Witch Trials?, by Joan Holub ; illustrated by Dede Putra
- What is the World Cup?, by Bonnie Bader ; illustrated by Stephne Marchesi
- What was the Children's Blizzard of 1888?, by Steve KorteĢ ; illustrated by Dede Putra
- What was the underground railroad?, by Yona Zeldis McDonough ; illustrated by Lauren Mortimer
- What are the paralympic games?, by Gail Herman ; Illustrated by Andrew Thomson
- What was the age of exploration?, by Catherine Daly ; illustrated by Jake Murray
- What was the Hindenburg?, by Janet B. Pascal ; illustrated by David Groff
- What was the Vietnam War?, by Jim O'Connor ; illustrated by Tim Foley
- What was World War I?, by Nico Medina ; illustrated by Dede Putra
- What is the Panama Canal?, by Janet B. Pascal ; illustrated by Tim Foley
- What is the Super Bowl?, by Dina Anastasio ; illustrated by David Groff
- What was Ellis Island?, by Patricia Brennan Demuth ; illustrated by David Groff
- What was the Titanic?, by Stephanie Sabol ; illustrated by Gregory Copeland
- What was the Great Chicago Fire?, by Janet B. Pascal ; illustrated by Tim Foley
- What is the Declaration of Independence?, by Michael C. Harris ; illustrated by Jerry Hoare
- What were the Shark Attacks of 1916?, by Nico Medina ; illustrated by Tim Foley
- What was the Donner Party?, by Ben Hubbard ; illustrated by Tim Foley
- What was the first Thanksgiving?, by Joan Holub ; illustrated by Lauren Mortimer ; cover illustrated by James Bennett
- What is the Statue of Liberty?, by Joan Holub ; illustrated by John Hinderliter
- What was Pompeii?, by Jim O'Connor ; illustrated by John Hinderliter
- What was the Tulsa Race Massacre of 1921?, by Caleb Gayle ; illustrated by Tim Foley
- What was Reconstruction?, by Sherri L. Smith ; illustrated by Tim Foley
- What was D-Day?, by Patricia Brennan Demuth ; illustrated by David Grayson Kenyon
- What is climate change?, by Gail Herman ; illustrated by John Hinderliter
- What was Stonewall?, by Nico Medina ; illustrated by Jake Murray
- What is the women's rights movement?, by Deborah Hopkinson
- What is the story of the Wizard of Oz?, by Kirsten Anderson ; illustrated by Robert Squier
- What is the Stanley Cup?, by Gail Herman ; illustrated by Gregory Copeland
- What was the bombing of Hiroshima?, by Jess M. Brallier ; illustrated by Tim Foley
- What was the plague?, Roberta Edwards ; illustrated by Dede Putra
- What Was the Great Chicago Fire?
- What Is the Declaration of Independence
- What was the Gold Rush?, by Joan Holub ; illustrated by Tim Tomkinson
- What was the Ice Age?, by Nico Medina ; illustrated by David Groff
- What was the Tulsa Race Massacre of 1921?, by Caleb Gayle ; illustrated by Tim Foley