I have a stillborn sub with a similar idea behind it - the Karth. One of a fleet of autonomous warships, the lone (cliche) survivor of the class. It has gone off to make a small empire for itself in a far flung corner of humanspace. Might revive it. Go to Comment
I like the visual of this thing hanging in the sky among the stars.
I find it odd that the US would see the need to nuke Canada, as conventional forces would have a pretty easy time of it, and unless the nukes were tiny, they would be obliterating a good portion of their own population. Detroit, New York state, Oregon, etc. Most of our population is within 100 miles of the states and it would seem like using nukes in a civil war. That and I expect by the timeframe in question, a huge amount of the american water supply would come from Canada.
These little beetles have heads at both ends of their bodies. This allows them to feed on leaves at twice the rate of their normal cousins, causing great damage to crops. They look like ladybugs more than actual beetles, but have no wings. They have a funny way of moving if one stops to watch them, as both heads seem to vie for picking the direction at any given time. Their favorite nourishment is sugar cane. After feasting on these for some time, they develop short bursts of frenetic energy, and can be seen racing back and forth without purpose, which looks quite comical to onlookers. They are otherwise normal bugs. Of course the pc's might not know that.