Indigenous Aryans were inter-related, and the notion of biological race came to the forefront The "Aryan race," the presumed identity of Indo-European language speakers was prominent among such races, which was seen to be further subdivided into "European Aryans" and "Asian Aryans," each with their own homelands. Max Mueller, who translated the Rigveda during 1849–1874, postulated an original homeland for all Aryans in central Asia, from where a northern branch was believed to have migrated to Europe and a southern branch came to India and Iran. The Aryans were fair-complexioned Indo-European speakers who conquered the dark-skinned "dasas" of India. The upper castes,
Name of Mexico of the country is the "United Mexican States" (), since it is a federation of thirty-two states. The official name was first used in the Constitution of 1824, and was retained in the constitutions of 1857 and 1917. Informally, "Mexico" is used along with "Mexican Republic" ("República Mexicana"). On 22 November 2012, outgoing Mexican President Felipe Calderón proposed changing the official name of the country to "México". Anahuac (meaning land surrounded by water) was the name in Nahuatl given to what is now Mexico during Pre-Hispanic times. When the Spanish conquistadors besieged México-Tenochtitlan in 1521, it was almost completely destroyed.