Before Jamestown. Before Plymouth. There was St. Augustine. In 1565-fifty-five years before the Pilgrims set foot at Plymouth Rock-Spanish ships slipped along the Florida coast and anchored in a shallow inlet guarded by marsh and sand. What they built there would become the oldest continuously occupied European-founded city in the continental United States. Yet its story has been pushed to the margins of the American narrative. Dawn of an Empire restores St. Augustine to its rightful place at the center of the nation's origins. Here is the clash of empires-Spain, France, and England-fighting not only for land, but for souls, treasure routes, and control of the Gulf and Atlantic sea lanes. Here are the Timucua and Calusa peoples, whose alliances and resistance shaped the fate of the colony as surely as any royal decree. Here are missionaries and soldiers, enslaved Africans who found freedom under the Spanish flag, pirates on the horizon, and hurricanes that nearly erased the fragile settlement from the map. Far from a footnote, Spanish Florida was a proving ground. It forged the first multicultural frontier in what would become the United States. It established the first parish, the first fortifications, the first legally sanctioned free Black community in North America. It endured siege, starvation, rebellion, and revolution-yet survived. This is not simply the story of a city. It is the story of an empire's northern edge-and the forgotten beginning of America itself.