Chicago marriage license indicates "Christii or Christie" Selvig (age 26) married Annie Lund (age 24) 14 Oct 1893 in Chicago, Illinois.
Chicago death record for Christopher Selvig gives information about exactly when he was born, some 'approximation' of WHERE in Norway he came from and even his father's given name.
You can also get more information about that still small family with 3 daughters in the 1900 US census (look for last name "Selwig"). The month and year of each birth, country of birth, year of immigration to US. All of that information is VITAL to being able to locate the origins of their family histories in Norway. In 1900 Christopher is employed as a janitor.
Source: RecordSearch at familysearch.org