...owning nukes is illegal in Chicago.
From the Chicago Municipal Code.
(a) Phase-out of present activities. No person shall knowingly, within the City of Chicago, design, produce, deploy, launch, maintain, or store nuclear weapons or components of nuclear weapons. This prohibition shall take effect two years after the adoption and publication of this ordinance...
...Each violation of this ordinance shall be punishable by up to 30 days’ imprisonment and a $1,000.00 fine. Each day of violation shall be deemed a separate violation.
Nuclear Free Zones- because nothing deters nuclear terrorism like the threat of 30 days in prison.