I don't know if you have a subscription to Ancestry, but William Bork's passport application is there.
born February 15, 1873 in Nedlin, Germany
Father, Albert Bork, born in Germany now deceased
William emmigrated to US from Rotterdam, Holland on January 19, 1902 and has resided in United States from 1902-1923
He was naturalized in the Circuit Court of Langlade County at Antigo on November 9, 1908
Intends to travel to Germany (for settlement of inheritance) and to France and England (for a visit) and plans to leave about June 5, 1923 from New York and plans to return within 6 nmonths.
1920 Census, Antigo, Langlade County
William Bork age 4? born Germany
Martha Bork age 40 born Germany
Gertrude A. Bork, age 15, born Wisconsin