The Irish people (Irish: Muintir na hÉireann or na hÉireannaigh; Ulster-Scots: Airisch or Airish fowk) are an ethnic group who originate in Ireland, an island in northwestern Europe. Ireland has been populated for around 9,000 years (according to archaeological studies, see Prehistoric Ireland). The Irish people's earliest ancestors are recorded in legends – they are claimed to be descended from groups such as the Nemedians, Fomorians, Fir Bolg, Tuatha Dé Danann and the Milesians.Lebor Gabála Érenn, a book of Irish mythology tells that Tuatha Dé Dananns were Scythian descendants.

The main groups that interacted with the Irish in the Middle Ages include the Picts, Scots, and the Vikings. Due to this contact, Icelanders are noted for having some Irish descent. The Anglo-Norman invasion of the High Middle Ages, the English plantations and the subsequent English rule of the country introduced the Normans and Flemish into Ireland. Welsh, Picts, Bretons, and small parties of Gauls and even Anglo-Saxons are known in Ireland from much earlier times.

Mexican people (Spanish: Pueblo mexicano (collective), Mexicanos (individuals)) refers to all persons from Mexico, a multiethnic country in North America, and/or who identify with the Mexican cultural and/or national identity.

Mexico became a nation in 1821 when Mexico achieved independence from the Spanish Empire; this began the process of forging a Mexican national identity that fused the cultural traits of indigenous pre-Columbian origin with those of European, particularly Iberian, ancestry. This led to what has been termed "a peculiar form of multi-ethnic nationalism"

The most spoken language by Mexicans is Mexican Spanish, but many also speak languages from 62 different indigenous linguistic groups and other languages brought to Mexico by recent immigration or learned by Mexican immigrants residing in other nations. Over 78% of the Mexican people live in Mexico but there is a sizable diaspora with nearly 22% living in the United States.

The Mexican people have varied origins and an identity that has evolved with the succession of conquests among Amerindian groups and by Europeans. The area that is now modern-day Mexico has cradled many predecessor civilizations, going back as far as the Olmec which influenced the latter civilizations of Teotihuacan (200 B.C. to 700 A.D.) and the much debated Toltec people who flourished around the 10th and 12th centuries A.D., and ending with the last great indigenous civilization before the Spanish Conquest, the Aztecs (March 13, 1325 to August 13, 1521). The Nahuatl language was a common tongue in the region of modern Central Mexico during the Aztec Empire, but after the arrival of Europeans the common language of the region became Spanish.