From experience, Spanish is only spoken widely in Florida, California, New York City, etc where there is a large population of recent immigration from Spanish speaking places. The US is such an enormous country that in many places you'd never hear Spanish spoken anywhere.

Even if you learned Spanish at school (and many Americans learn French or German or Japanese instead) you might never really use it. For example, I recently met someone who was training as an English teacher here from Colorado who only knew school French, another from Ohio with a degree in Spanish who'd never had the chance to speak the language outside the classroom - and this doesn't seem to be unusual.

Spanish is growing, but it's nowhere near taking over from English in most areas.