Iowa: 3.1%. According to our research of Iowa and other state lists there were 2 registered sex offenders living in Aurora, Iowa as of September 06, 2015. The ratio of number of residents in Aurora to the number of sex offenders is 86 to 1.
William G. Sumner, who coined the term ethnocentrism, is famously known as America's first sociology professor. He taught social sciences at the Yale University. It is wondrous, really, how this world is made up of so many different people belonging to different races or ethnicities.
The view that ethnocentrism could be explained via kin selection is due originally to the founder of the idea, esteemed biologist WD Hamilton. I just don't have the first hand reference available, so I chose to quote Dawkins. Just wanted to make clear that it's not pop-sci.--Babank (talk) 00:17, 4 April 2011 (UTC)