Unit Three in an American history curriculum prepared for the Los Angeles high schools is concerned with the westward movement. Discussed are the early explorers and trappers, the acquisition of new lands, California's early history, and the settlement of the Great Plains. The chapters include a summary reading, several activities, some enrichment material, and a review discussion. For other units in this series, see UD 007705, UD 007706, and UD 007708. (NH)