Cyborgs, Immortals, and Spacefarers: Book 1 of An End of Our Own Making by Aristotle Evangelos

After the next war, what's left of humanity struggles against extinction. Three connected social science fiction stories: The Immortalists, 1000 years after the war: Immortals trying to save their community are on a collision course with a farmer determined to protect his people. The Leavers, 500 years after the war: The corporations rule the solar system, and the Earth is off limits. A shadowy group of activists seeks to disrupt the established order, and an ion ship captain is sent to stop them. The Cyborgs, 200 years after the war: Cyborgs are a vanishing breed. They trust no one, especially not each other. Still, they must survive.