Santiago de la FronteraSantiago de la Frontera is a district that is a part of the municipality Santa Ana Oeste in the Santa Ana department of El Salvador.HistorySantiago de la Frontera began as a Spanish settlement around 1770, with it falling under the district of Metapán after 1786.Post IndependenceIt was under the department of Sonsonate until 1855, when the department of Santa Ana was created. In 1848, a partition of Guatemala joined the valley of Santiago, expanding the territory of the municipality.