The territory had complex indigenous civilizations before being conquered and colonized by the Spanish in the 16th century, after a protracted struggle (1810–21) for independence, New Spain became the sovereign nation of Mexico, with the signing of the Treaty of Córdoba. Slavery was not abolished at independence in 1821 or with the constitution in 1824, but was eliminated in 1829. 
The French Intervention is the period when France invaded Mexico (1861), to collect on defaulted loans to the liberal government of Benito Juárez, but it went further and at the invitation of Mexican conservatives seeking to restore monarchy in Mexico set Maximilian I on the Mexican throne.

I believe history is still taught in school but didn't know we had to contribute or embrace all heritages and cultures other then the American heritage and culture?