List the states that appear on both the 1790 and 1890 maps. Students will analyze population density and population shifts. A Mean Center of Population map is a useful tool in assessing population shifts. Reasons for these shifts include historical movements, such as westward expansion, as well as economic trends. The Population Density map shows where people in the U.S. live, county by county.
Students can use the map key to determine how densely populated particular counties are.
Balance the envelope on your fingertip. Demonstrate the balance point to the class. Then move 2 paper clips from one side of the envelope to the other, so that one side has 5 clips and the other has one. Demonstrate how the balance point shifts. Be sure students know which area of the U.S. the map on page 8 shows.