In the third book in the New York Times bestselling middle-grade series from Yuval Noah Harari, explore how different ancient civilizations united and created the countries and cultures we have today!

How do you become friends with your enemies? The answer to all of that is one of the strangest tales you'll ever hear. And it's a true story!

Books, movies and video games are full of stories about wars, battles and empires, but where did all these conflicts come from? More than 2,000 years ago, humans collaborated, exchanged stories, and married those from different lands. New cities and cultures were formed, and languages and religions were shared. But sometimes our differences become bigger than the things that unite us, turning us from neighbors to enemies.

From exchanging food and traveling across oceans to building empires and developing religions, prepare to explore how early civilizations interacted with each other and shaped the way we are today.

Includes a map, timeline and full-color illustrations.