The lessons in this 3-part series are intended to provide students with a basic understanding of the relationship between the United States and Mexico, with emphasis on multiple perspectives, conflict and cooperation, and interdependence. This curriculum unit, Part 2, examines three contemporary issues: immigration, the North American Free Trade Agreement (NAFTA), and the environment. The introduction presents a rationale, state and national history standards, series goals, matrix of lessons, materials needed, time and suggested sequence of activities, and small-group roles. The unit contains four lessons: (1) "Setting the Context for U.S.-Mexico Relations" (contains a questionnaire, 2 handouts, and 4 maps); (2) "Studying Contemporary Immigration through Small Group Work" (contains a handout, 4 activity cards, 13 resource cards, and group assignments); (3) "What Is NAFTA?: A Look at International Trade and Economics" (contains 2 teacher information cards, a transparency, 2 handouts, 2 activity cards, and a glossary); and (4) "NAFTA and the Environment: The Debate Continues" (contains a handout, a reference sheet for the teacher, web diagram pieces, a transparency, 2 resource sheets, and a student worksheet). (BT)