I wiped out Chicago with 2 MIRV (1.1Mt). So, Milwaukee is the new capital city in my game for CivGov and Milgov rules from Seattle. Actually, both Omaha and Colorado Springs were leveled.
Each location was hit by a SS-18 Satan (20Mt) as they were among the 5-6 main strategic targets to the Russians.
Don't forget my game takes place today and targets have changed slightly.