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Humanity had first spread into space four hundred years before the life of Kris Longknife. The Society of Humanity was a federation of planets occupied by the human race. Earth dominated the Society, which consisted of 600 planets. The society kept the peace for eighty years following the Iteeche Wars.
Consisted of 48 planets before the Unity Wars and 150 immediately afterwards.
The society fell apart at the end of Mutineer and was referred to as being defunct in Intrepid. And replace by the new United society of humanity by book 10 and had over 2800 human planets and some alien ones equaling 3000 planets