Title: Portugal.
Question: What makes weather predictions difficult in the archipelago region?

Title: Guam.
Question: What is the name of this U.S state that could possibly form a union with Guam?

Title: Sino-Tibetan relations during the Ming dynasty.
Question: In what century did the Tibetan Empire fall?

Title: Pope Paul VI.
Question:
In what year was the name "Paul" last used as a pontifical name before Pope Paul VI became Pope?