This article provides a historical overview of American Citizenship Day, a holiday celebrated in Puerto Rico to mark a pivotal legislative milestone. It recounts the island’s transition from a Spanish territory to a United States possession following the military conflicts of 1898. Central to the text is the Jones-Shafroth Act of 1917, which officially granted U.S. citizenship to the island’s inhabitants and reorganized their local government. While the document highlights the establishment of a bill of rights and a local Senate, it also notes the ongoing political limitation regarding presidential voting rights for residents. Ultimately, the source serves as a concise chronicle of the le …