<p>The latest editions of the most widely used social studies textbooks across the country are full of errors and politically correct bias, reviews show.</p>
<p>Publisher McDougal Littell's high school "World History: Patterns of Interaction" blames explorer Christopher Columbus for "the beginnings of an era of widespread cruelty and bloodshed" in the Americas, but fails to mention Aztec, Mayan and Toltec Indian practices of forced labor and cutting out hearts of opponents while they were still alive.</p>