Poul Anderson 
Psychotechnic League [EPUB ebook] 
Psychotechnic League Book 4

In the beginning was World War III…Out of the flames was born a new civilization, a new humanity dedicated to one world rather than to many nations, to once peace rather than many wars. Never again on Planet Earth would one group of humans "defend" themselves against another group equally convinced that all their actions were "defensive". Never again on Planet Earth.But cycles repeat themselves endlessly; Earth is only the beginning of the human story. Next comes planet against planet, and then the stars themselves. Through it all the impersonal forces of historical necessity will tend to force that story into the pathways of tyranny, stasis, and war. And in the end they must prevail. But ever will humankind win free once more…