English is an official language of the island, and I am Puerto Rican and a native speaker of English. They don't want to abandon Spanish in lieu of English, but speak English all the same, or are you going to argue that we should start kicking out states or parts of the country that have majority Spanish (or other than English) speakers? Wisconsin was dominated by German speakers at one point. Should it had been refused admission to the states? 
Again, you're not even bothering to step outside your bubble, as I predicted initially. So this is my last response to you unless you say something worth responding to rather than cycling through the same tired lines.
English is AN official language of Puerto Rico, but not THE official language. This would make it unique, in that English is the sole language of business and government for all 50 states. Yes, there were communities in North Dakota that spoke German, and only German, in daily life, but English was still the language of business and government.
I would like to see Puerto Rico as our 51st state, but it should be on a basis where the rest of America does not have to learn Spanish to accommodate Puerto Rico. It is the responsibility of the entity that wishes to join the Union to make accommodations, not the other way around. I'm all for people being multi-lingual, but it's not a requirement of American life and shouldn't become one.
To be fair, I'd say this is the biggest hurdle in PR becoming a state (as it should if the people there agree). And even then, I guess a worst case scenario would look like Quebec in Canada. Except PR is nowhere near as influencial in the US as Quebec is in Canada.
Puerto Ricans are Americans for better or worse. Just as American as someone from say, New York.
