These churches have been at the forefront of Philippine history, not just in furthering Christianity in the archipelago, but in serving as the political backbone of Spanish colonial rule, when Church and State were regarded as one. The unique architecture of the churches did not just reflect the adaptation of Spanish/Latin American architecture to the local environment (including the fusion with Chinese motifs), but also of the Church's political influence. These churches had been subject to attacks by local revolts and rebellions, hence, most had the appearance of a fortress, rather than just serving as mere religious structures. This is especially noteworthy in the case of Santa Maria Church, located on top of a hill, serving as a citadel during times of crisis. Miag-ao Church also withstood the occasional attacks of Muslims from the south. Further, the location of the Philippines along the Pacific Ring of Fire called for the emphasis on the buttresses and foundations of these churches, with some being seriously damaged, but eventually rebuilt after an earthquake.