And another thing, we would be admitting a state where the majority of people don't speak English as a first language. What this does is basically make Puerto Rico our "Quebec", and therefore we will essentially have two official languages, English and Spanish.
We already have that. Round these parts it is difficult to find a job unless you speak at least some Spanish. It is like that in many parts of the county. Florida, Cali, Texas, New Mexico, Arizona, and others.
Our children will likely speak Spanish at some level. It will be necessary for employment. As you said very appropriately, like Quebec.
As someone posted earlier on another thread, this is part of the reason that American Blacks are freaking out lately all over the country. Blacks are no longer America's number one most influential minority anymore. And it is driving them nuts. Once most low level jobs require Spanish, Blacks will be all but cut-out of that job market altogether.