Disclaimer: I do not own anything Hetalia-related. It is all the work of Hidekaz Himaruya and further anime adaptations.
Hetalia PR: Micro-chapter Two
Puerto Rico's marriage to Spain would soon prove to be an unhappy one. Spain was incredibly busy, probably keeping tabs on many "significant others" such as Dominican Republic, Cuba, Mexico, Jamaica… while trying to maintain a smooth relationship with Portugal. Puerto Rico worked hard, wondering if her already extinct tribes really thought the Spaniards were gods. For almost three hundred years, Puerto Rico would display outbursts of loyalty to Spain, but even the Situado Mexicano, or the shipment of gold Spain provided to Puerto Rico, wasn't enough. The Puerto Rican peso, wasn't also enough. Spain grew jealous of England and Holland, who both wanted to marry Puerto Rico, and defended the lights and guns out of them.
Puerto Rico grew tired and ill. Moonshine, sugar cane, spices, cattle, tobacco, cockfighting, and Spanish emigration and immigration flourished all around, but Spain did not really know what to do with her. All his other colonies rebelled against him, which made Spain grow weary. For the last hundred years of marriage, a surly Spain sought her affection. "Forget Mexico," he said, "forget everyone else," he uttered, "Puerto Rico is still mine" he vowed.
Still, Puerto Rico knew better. Her brother, Cuba, had already organized El Grito de Yara in1868, an independence movement against Spain, which was successful. Feeling hopeful, Puerto Rico orchestrated her own rebellion, El Grito de Lares, on September 23 of that same year. Tired as she was, Puerto Rico mustered all the strength and will she could, but failed. Cuba visited her, patted her on the back, amid a chorus of "don't worry, you and Spain will part ways" and "you'll be independent, like me".
Over the next thirty years, Spain would watch over his wife, lamenting how bullfighting never became popular over this side of the pond. He feared he would lose her. He had much to lose. Then, in 1898, the Spanish-American War happened.
Defeated, Spain signed the Paris Peace Treaty/divorce papers on December 10, 1898. Almost like a father, rather than a husband, Spain handed his now exes (Puerto Rico included) over to America for twenty million. Distraught, thinking her ex's strategy was cheap, Puerto Rico settled in with America in a larger house. What America would call progress, she would not know what to call it herself.
A similar scene ensued: "America… I'd like you to leave" Puerto Rico told him. America was comfortably lounging on a couch. "What?!" America blurted out his disbelief. "Look, France tried to marry me when it didn't work with England and now I don't think I'm ready to marry you. Guess what, you could be my girlfriend! That sounds more like what I'd do!"
Puerto Rico stood there, nonplussed. For a glimpse of a moment, she missed Spain. How would she deal with America?
"Spain? Spain who? He's probably crying himself to sleep now. Yes! We're going to be boyfriend and girlfriend! Tomorrow, in fact! You'll learn my language, my religion, my traditions…" America rambled, loud and smiling all the same.
Puerto Rico let out a big sigh. "These were Spain's exact words before we got married."
It may and it may not be continued.