Considering this never-reprinted tale was published over in 1949...
...it's almost frightening to see how applicable the story's moral is to the problems of today's America!
Heroic Hunt Bowman and the duly-elected Earth Council decide on a course of action...gathering the surviving children of North America in a well-prepared location to teach them what they'll need to survive and fight back against the invading VoltaMen.
Rabble-rousers claim Bowman's actions are violating their personal freedom and endangering their children!
(Apparently Republicans survived the invasion from Volta!)
Happily, by the end of the tale, the Repugs...I mean idiots...have learned the error of their ways and the School for Survival is now in session!
Sadly, in the real world, the fools who claim their personal freedom take priority over their survival haven't learned...and may not live long enough to do so!