On their way to return to the Athena Parthenos to Camp Half-Blood, Nico di Angelo, Reyna Ramírez-Arellano, and Gleeson Hedge are teleported to San Juan by magic using members of the Amazons and the Hunters of Artemis so Reyna can talk with her sister.
- Puerto Rico became a U.S. Territory following the Spanish-American War along with Guam and The Philippines.
- The flags of Puerto Rico and Cuba are almost identical with only the red and blue switched. Both are modeled after the flag of Catalonia.
- The Spanish Virgin Islands are today a part of Puerto Rican territory.
- As a commonwealth territory of the United States, Puerto Rico is considered a state in nearly every way except in name and ability to have delegates who vote in Congress.