Possible Clues:

• Minn. neighbor
• Sask. neighbor
• Neighbor of Minn.
• Mont. neighbor
• Bismarck's state: Abbr.
• Fargo's st.
• Fargo's state: Abbr
• Site of Theo. Roosevelt Natl. Park
• Fargo's state: Abbr.
• Neighbor of Sask.