The United States has been using science and pseudo-science to wage psychological wars for centuries. Psywar as we know it in America grew up during the Indian Wars of the 19th century, where U.S. troops fought hundreds of Indigenous nations and confederated tribes, using battlefield anthropologists to gather information about the enemy. Read more in my latest @newscientist column, or check out my forthcoming book "Stories Are Weapons." https://www.newscientist.com/article/mg26234910-900-how-the-us-used-science-to-wage-psychological-war/