Students will examine population density maps of the United States during the 1800s. They will learn about the Louisiana Purchase in 1803 to make and evaluate predictions about the changes in population density that resulted from this event, identifying shifts in boundaries and in areas of population density, and drawing conclusions. Students will then write a paragraph summarizing the impact of the Louisiana Purchase on the United States. Suggested Topics: Louisiana Purchase Westward expansion. Topics: Louisiana Purchase Westward expansion.