Imagine taking a huge flat map of the United States and placing weights on it to represent where people live. The point at which the map would balance is called the mean center of population. Figure 4.2 shows how the location of the mean center of population has shifted from 1790 to 2010. Briefly explain the pattern shown on this map.

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IOWA PENNSYLVANIA ILLINOIS INDIANA OHIO 1800 1920 1910 1890 1870 1860 1850 1840 MISSOURI 1960 1950 1940 1970 1790 1930 1900 1880 1830 1820 WEST 1810 1980 1990. MARYLAND VIRGINIA VIRGINIA 2000 KENTUCKY 2010 ARKANSAS TENNESSEE NORTH CAROLINA