Puerto Ricans are Americans. We've been American citizens since 1917. We fought the same battles, made the same sacrifices. We've lost our land in the same way that Native Americans lost their land, and we've been the subject of discrimination and racism in the same way that African Americans have. We've suffered the full spectrum of oppression, and yet we've been off the map 4,000 miles away so we haven't even been able to argue our case.
Puerto Rico is an island separated by an ocean, a language, a culture. All of that put it in a position where it's like, "What happens in Vegas stays in Vegas," but what happened in Puerto Rico never happened at all. It's not like there was a decades-long conspiracy. It's just the aggregation of all these historical forces made it difficult for this information to exist in one place.
Puerto Rican independence movement wasn't just rooted in some sort of personal intransigence or some passionate Latino temperament. It was rooted in economic and political reality at the time. It also made sense since the founding principles of the United States are supposedly based on government by the consent of the governed, and the sense that all men are created equal.