Sequel

I do not know the circumstances behind the publication of Roger Elwood's Continuum anthologies. Was Poul Anderson asked to continue an already existing series or just to contribute four new stories in which case it was he who decided that these contributions would constitute four additional Rustum History instalments, thus doubling the length of this series?

In any case, the first story in New America is a logical sequel to the fourth and concluding story in Orbit Unlimited:

Danny Coffin is no longer a small boy but a teenager;

Danny had a harrowing experience in the Rustumite lowlands so does not want to return there;

however, unlike most Rustumites, he is able to live comfortably in lowland conditions, therefore he is in demand there!;

thus, a human problem in an sf setting.

I certainly appreciate both the setting and the problem but would not have been able to create a story based on them whereas Poul Anderson was. Our next step here is to reread this fifth Rustum History instalment maybe some time this weekend.