Regionalization is a traditional method of geography for understanding regional features as well as the overall characteristics of a nation as a whole. This paper intends to review various attempts mostly by Americans at dividing the United States into regions on the basis of various criteria for varied purposes. Twenty-four examples of regionalization of the United States are presented, which include physical geographic regions, Native American culture regions, culture-economic regions of European colonization, federal administrative regions, economic-industrial regions, culture regions, ordinary people's perceptive regions, settlement process regions, and voting behavior regions. By laying division lines on top of another, I would suggest simple regionalization of dividing the country into four quarters with boundaries of the 37th parallel and the 95th meridian. Geographic characteristics of the four quarters are summarized in Table 1. This regionalization appears to be valid in geographic education in order to provide students with rough images of the United States.
