200 years ago a priest declared Mexico independent with El Grito de Dolores. Since then Mexico has been a liberal democracy, a pro-Catholic Hasburg Empire, an atheist revolutionary state which fought a war against the Catholic Church, a military dictatorship, an one-party state, and several variations in between. But it has always been Mexico: a combination of Spanish and American Indian cultures.
I cannot even pretend to give a moment like this justice. Check out Geo-Mexico for worthy blog posts.