Mary Julia Peterson / Norwegian Parents

@John F Peterson - I was adopted at birth. My daughter found my birth family in about 2010. Mom was from Greenville, SC and my dad (they never married) was from Milwaukee, WI. I took my DNA test and it shows that I am 48% Norwegian. I was shocked, as from being from South Carolina, I never even considered that. I found out that my birth dad’s family was mostly German and some came from the Netherlands. The 1910 Census did show on my dad’s side, that my great grandmother, Mary Julia Peterson was born in 1871/1872 in Wisconsin. But, it also showed on the same 1910 Census, where her parents were born in Norway, so that is where my Norwegian comes from, I assume. I have not had any luck finding her parents. I have looked all over the internet and family trees, etc, but no luck. I am missing something, but don’t know what and where else to look. I am thinking, after reading your page, that the spelling changed, but again, I don’t where or what to look for. I sure hope you can help me, as this is so important to me. Thanking you in advance. Susan