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The Copper Throne Book Three of Thunder in 1519 Fort Rainbow is no longer merely surviving in the past. Its roads carry law. Its springs are counted. Its mills, pumps, workshops, and foundries are turning survival into power. What began as a hidden refuge is becoming something far more dangerous: a state. But in 1519, every road invites an empire. As Spanish forces probe the coast and inland powers move to measure, bargain with, or break this new order, Captain Mara Ellison and her people face a brutal choice. If they defend their growing civilization, they risk becoming the very kind of power they once feared. If they hesitate, the future they built will be cut apart—road by road, spring by spring, line by line. With aviation fuel limited, supply routes under threat, and every act of protection carrying a political cost, Fort Rainbow must fight not only for survival, but for the right to decide what history becomes. The Copper Throne is an alternate-history time-travel military thriller about empire pressure, infrastructure war, industrial rise, and the birth of government in a world that was never meant to see the future this soon.