Chelsea S. answered 05/16/18
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Experienced Interpreter Specializing in Grammar, With a BA in Spanish
Alissa made some good points. One of the key differences you would learn about in Spanish classes is the 'vosotros' form, which is not used in Mexican Spanish. You conjugate using the 'vosotros' form when you're addressing multiple people informally (it's like saying y'all), but Mexican Spanish just uses the Ustedes form. The Ustedes form is used universally throughout the Spanish-speaking world.
Pronunciation is very different, although you would typically have to be a native speaker or have studied linguistics to pick up on some of the subtleties. The word 'gracias' is pronounced more like 'grathias' in Spain. Puerto Rican and Dominican Spanish sound different as well.