Startide Rising

"We are not alone. Humanity's explorations have revealed galaxies inhabited by millions of intelligent species interacting under ancient traditions. Foremost among said traditions is uplift, which requires all spacefaring races to welcome newcomers into Galactic culture by breeding and genetically guiding each client species to full sapience--but at a price. Patron races demand centuries of indentured servitude from each uplifted client. But is upstart humanity a patron or a client?"--