How do you spell the 21 Spanish countries in Spanish?

México, Cuba, República Dominicana, Puerto Rico, España, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panamá, Argentina, Bolivia, Chile, Colombia, Ecuador, Paraguay, Perú, Uruguay, Venezuela, Républica de Guinea Ecuatorial.

As you can see, most of them are spelled the same in English and Spanish, or with an accent mark or tilde added, but the pronunciations are different in English and Spanish.