Oskar emigrated 28 Nov 1908 to America. He was employed as a farmer in Harding Co., South Dakota. He registered for the draft 1917/1918 in Harding Co., South Dakota. Adopted the name Oscar Carlson when he came to USA.

Homesteaded a farm in South Dakota, 160 acres in Harding Co., title transfered in Lemmon office (coordinates from Bureau of Land Management), as early as 1913. (Source BLM records) http://searches.rootsweb.com/cgi-bin/ifetch2?/u1/data/sd+index+6269859671=02+F)

Oskar married Unknown in Harding Co., South Dakota. The marriage ended in divorce.
Oscar married the woman that owned the neighboring farm. This lasted a short time - they separated and he had no children. She was a widow with more than 1 child (possibly with 1 year difference in ages), grown up at the time of his marriage. Her husband was often gone for a year at a time, then he died.6