FILE - In this June 14, 2007 file photo, Washington police block traffic on Massachusetts and North Capitol Street in Washington. Rural places account for just 16 percent of the nation's population, the lowest share ever, while metro areas are booming into sprawling megalopolises. (AP Photo/Jacquelyn Martin, File)

Associated Press
FILE - In this June 14, 2007 file photo, Washington police block traffic on Massachusetts and North Capitol Street in Washington. Rural places account for just 16 percent of the nation's population, the lowest share ever, while metro areas are booming into sprawling megalopolises. (AP Photo/Jacquelyn Martin, File)
FILE - In this June 14, 2007 file photo, Washington police block traffic on Massachusetts and North Capitol Street in Washington. Rural places account for just 16 percent of the nation's population, the lowest share ever, while metro areas are booming into sprawling megalopolises. (AP Photo/Jacquelyn Martin, File)
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