I’m not going to lie, these would be helpful for me too. There are SO many more than the ones listed here!

Bookshop.org:

What Was The Battle of Gettysburg?: https://bookshop.org/a/96945/9780448462868

What Was The March on Washington?: https://bookshop.org/a/96945/9780448462875

What Was The Boston Tea Party?: https://bookshop.org/a/96945/9780448462882

What Was The Gold Rush?: https://bookshop.org/a/96945/9780448462899

What Was Pearl Harbor?: https://bookshop.org/a/96945/9780448464626

What Was The San Francisco Earthquake?:

https://bookshop.org/a/96945/9780399541599

What Was The Alamo?: https://bookshop.org/a/96945/9780448467108

What Was The Underground Railroad?: https://bookshop.org/a/96945/9780448467122

What Was Pompeii?: https://bookshop.org/a/96945/9780448479071

What Was Ellis Island?: https://bookshop.org/a/96945/9780448479156

What is The Statue of Liberty?: https://bookshop.org/a/96945/9780448479170

What is The Panama Canal?: https://bookshop.org/a/96945/9780448478999

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