O Era

Because of an alien invasion, humanity gave artificial intelligence 80 percent self-awareness, granting it the ability to make judgments based on self-recognition and a mechanism for self-preservation. They then used it to fight the alien organisms. The war ended, leaving Earth severely contaminated by nuclear fallout, with gasoline, engine oil, and the ruins of cities all around. The cost of the war was enormous, and people thought it was finally over. Who could have known that everything was only the beginning of humanity's plan...