This is the seventh unit in a series that introduces population concepts into the eighth grade American history curriculum. (See SO 013 782 for an overview of the guide.) In Episode VII, the history topic is America becomes a world power. Objectives are to help the student to (1) emphasize the forming of a conceptual understanding of the terms immigration and emigration, particularly in the context of U.S. history; (2) form hypotheses explaining the relationship between migration and the social, economic, demographic, and political conditions that lead people to emigrate from one country and those conditions that attract people to immigrate to another; (3) collect and analyze data describing the patterns of immigration to North America between 1820-1920; (4) examine the problems faced by different groups of immigrants coming to the United States; and (5) take and defend positions regarding the formation of public policies pertaining to immigration. Activities include involving students in writing stories describing a group of people who immigrate to the United States, examining materials that describe some of the conditions that encouraged Europeans to immigrate to the United States, and planning a city. (NE)