Here is a look at the largest ancestry groups in Kansas:
http://www.euro-americans.blogspot.com/2013/06/kansas-largest-ancestry-groups.html (http://www.euro-americans.blogspot.com/2013/06/kansas-largest-ancestry-groups.html)
The German influence is strong, over 1 out of 4 Kansas residents have a German background.
The survey comes from the US Census Bureau's 2010 American Community Survey. This report is a bit more detailed than the short form decennial survey.