See for example
The Better Angels of Our Nature: A History of Violence and Humanity, by Steven Pinker
Or the first chapter of
Utopia for Realists: How We Can Build the Ideal World, by Rutger Bregman
It contains extensive citations, and costs about twelve to seventeen bucks on Amazon, depending on whether you buy it as an e-book, paperback, or hardback. If you don't wanna spend that much money, buy it and send a picture/screenshot of the receipt to firstname.lastname@example.org, and I'll cover it for you.
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