In Mexico, crêpes were introduced by the French during which century?

In Mexico, crêpes were introduced by the French during the 19th century.

In Mexico they are commonly called crepas, reflecting their French origin and the adoption of French culinary techniques. The 19th century brought substantial French influence to Mexico, especially during the period surrounding the French intervention and the rule of Emperor Maximilian in the 1860s. French cooking became particularly fashionable among elite and urban communities.

Mexican crepas did not remain an exact copy of French crêpes. Local cooks adapted them with ingredients and flavors associated with Mexican desserts and regional cuisine. Sweet versions may use cajeta, a caramel-like goat’s-milk confection similar in use to dulce de leche, while savory versions can feature distinctly Mexican ingredients.

The date is sometimes confused with the 20th century because crêpes became more visible internationally through restaurants and commercial food culture later on. That later popularity is different from the historical introduction described in the question.