National boundaries in the Atacama region had still not been definitely determined when nitrate, silver and copper deposits were discovered in the area. Both Bolivia and Chile established competing claims for the territory. Other countries' interest was drawn due to the importance of nitrates in the production of fertilizer and high explosives; Britain, Spain and the United States had a strategic and economic stake in controlling the resource granting their support to the different parties. Chile's influence grew in the disputed zone as miners, some of them backed by Chilean and foreign companies, started to advance northwards establishing mines and port facilities. Most economic exploitation of the coastal region was being conducted by Chilean companies and British interests, under the aegis of Chile's more robust economy and more stable institutions.