In 1828, five years after the premiere in Venice of Rossini's final Italian opera, Semiramide, Gaetano Rossi's libretto was again set to music, this time by the famed bel canto tenor and composer Manuel García in Mexico City. The opera, one of the first to be composed in Latin America after the collapse of the Spanish empire, was intended to demonstrate independent Mexico's ability not just to import Italian opera from Europe but also to produce new works. Instead of proving Mexico's credentials as a successful operatic nation, however, García's Semiramide became a problematic space for bringing to light tensions between underlying colonial resistance and the new liberal influence of France, England and Italy. This article contextualises this momentous operatic event within the wider frame of Mexico's nation building and investigates how the manifold political tensions and cultural contradictions of Mexico's postcolonial transition were absorbed and amplified by both García's composition and its staging.