What is the purpose of the statement, “Whereas in 1810 only a seventh of the American people lived west of the Appalachian Mountains, by 1840 more than a third lived there”?

• To illustrate that generally population shifts occur rapidly
• To correct a mistaken impression of American agriculture from 1810 to 1840
• To emphasize the range and speed with which the westward migration occurred
• To demonstrated how attractive the Appalachian Mountains were to Americans

This is a multiple choice.