The “Spanish” that you hear around the states is actually Castillian (Castellano). There are many other languages around Spain. Catalan, the language of Catalonia, appears to non-natives as closer to French than to Castillian.
I have family and friends from all over Spain (mostly refugees of the Franco dictatorship who moved to San Juan), and their elders speak all kinds of stuff: Euskara (Basque), Catalan, Aragonese, Galician, etc. But Castillian is the dominant and common language and the one that was exported to the Americas.
I took Spanish in high school and took a six week course at the Tech in Monterrey. My third year of Spanish in high school was with a teacher who spoke Spanish as in Spain.
Seemed to me there were more than a few differences in Spanish in Mexico vs. Spain.