I have 2 questions 1) John E Skundberg emigrated from Norway in 1870, the family changed surname to Anderson some where between 1880 Census and 1900. John's son Marthinus Skundberg aka Martin S Anderson has an 1882 naturalization date on the 1920 census. Same year he got married (I think). Did the name change require "formal" documentation?
2) What name would his naturalization papers be under?
I can track him via census records from 1880 to 1930.