I developed this lesson as the fourth in a series for a survey-style Global History course for summer school that was intended to assist students succeed at the August Regents. Through the lens of the question, 'When does might make right?', students are challenged to critically analyze the actions of Spanish conquistadors against the Mayan, Incan, and Aztec civilizations. The lesson begins with an experiential activity that facilitates students' understanding of the benefits of cultural diffusion. PowerPoint and lesson plan (including map work) are included. The lesson uses laminated maps for the activity, but these can easily be replaced with paper maps.