User blog comment:Damac1214/Black Ops 2 Uprising DLC Trailer Released + Double XP on April 12th to April 15th/@comment-24.14.168.185-20130405190304/@comment-1263839-20130406171537

Well, in the "future" or the post CotD setting of Zombies, it's about 90 years post Prohibition era. They probably would be dead or in a very fragile state at that point.