The attached Wisconsin Naturalization Index card fits your ancestor, and George born Jan 1849 is listed in Oconto County 1900 census with wife Louise and children.
Find A Grave shows George Albert Rasmussen born 31 Jan 1849 buried in Milwaukee, and the attached birth record from Rønne, Bornholm lists a Georg Alb--? Rasmussen born that date to Jens Rasmussen and wife Margrethe Elisabeth Møller.
(Not sure of middle name spelling, but Georg is European spelling of George)
But I don't find them in the transcribed 1850 census, or his confirmation.