In 2000, the five most common self-reported ethnic groups in the state were: American (17.3%), African American (13.0%), Irish (9.3%), English (9.1%), and German (8.3%). Most Tennesseans who self-identify as having American ancestry are of English and Scotch-Irish ancestry. An estimated 21–24% of Tennesseans are of predominantly English ancestry. In the 1980 census 1,435,147 Tennesseans claimed "English" or "mostly English" ancestry out of a state population of 3,221,354 making them 45% of the state at the time.
What European national ancestry was claimed by 45% of Tennessee residents in 1980? (If the question is unanswerable, say "unanswerable")
English