Thanks for responding. I have narrowed it down between late 1850 and probably 1852. I know that when the entire Hawkins family (Patrick Shields was married to Mary Hawkins) moved to Wisconsin, all the Hawkins children and their spouses had immigrated to the US. About half the family is living in Meriden, CT in Aug 1850 so I am guessing the remainder arrived after that time. I have searched the entire 1850 census for Meriden to see if some could have been living elsewhere, but there is nothing. I can only guess they hadn't arrived yet.