Which of these ancestries was the largest in Midwest region?

The United States Census Bureau defines the Midwest as including the following states: Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, and Wisconsin.

According to the 2010 United States Census, the largest ancestry in the Midwest region was German. German Americans made up 22.2% of the population of the Midwest. The second largest ancestry was Irish, at 11.3%. English, Italian, and Polish ancestries each made up over 5% of the population of the Midwest.