This lecture offers a broad, thematic overview of the period of European expansion known as the Age of Exploration. It introduces the period's key players (particularly Spain and Portugal), describes the mechanics of expansion (namely, technological and navigational advancements), motivations for advancement (the infamous "three G's), and ends by discussing the important foundational themes of colonialism, particularly African colonization and triangular trade.
There are many key terms (for the World History and European History AP tests) in this lecture, all of which are bolded for your convenience. I also used this lecture as background in my U.S. History AP course, as it's crucial background for the Americas.
Because it is about double the length of a normal class period and contains so much information, this lecture may be best spread over two class periods.