Houghton Mifflin Social Studies
Across the Centuries

Lesson at a Glance
Chapter 5, Lesson 1: The Roots of Mighty Empires (pp. 108-111)

The Big Idea
Framework Concept: Technology and Change As the Sahara's climate changed, people living there migrated south, creating new cultures, learning new technologies, and establishing thriving trade centers.

Lesson Outline
Use the Lesson Outline to preview the content of the lesson. You may wish to print it for your students as a guide during reading.

Check for Understanding


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