What did Spain do to Mexico?

Answer 1

It conquered and eventually began to colonize Mexico in 1521, during the Age of Discovery. After being a colony of Spain for 300 years, Mexico declared (1810) and won its independence from Spain in 1821.

Answer 2

Spain ruled Mexico for 300 years, from 1521 until 1821. This means they imposed their culture, language and religion on the original inhabitants of Mexico until its independence, in 1821.