Boarders:
The Pacific Ocean boundary of El Salvador is antecedent, because it corresponds to the ocean. The AMSCO textbook states, "This type of boundary preceded the development of the cultural landscape" (4.4). This boundary is an antecedent boundary because of the Pacific Ocean.
The Guatemalan boundary of El Salvador is subsequent. The AMSCO textbook states, "A boundary drawn to accommodate religious, ethnic, linguistic, or economic differences" (4.4). It is also consequent because it took existing cultural/ physical landscapes into account when it was built. "Sovereign Limits" states, "The boundary follows watersheds, rivers, and other geographic or man-made features in a southwesterly direction" (El Salvador–Guatemala).
The Honduras border of El Salvador is a subsequent boundary. It is also consequent because it took existing cultural/ physical landscapes into account when it was built. The AMSCO textbook states, "A type of subsequent boundary that takes into account existing cultural or physical landscapes. It's also an antecedent boundary because it mostly follows rivers. "Sovereign Limits" states, "The El Salvador–Honduras boundary extends for 402 kilometers (250 miles) from the tripoint with Guatemala to the Gulf of Fonseca in the Pacific Ocean, mostly following rivers" (El Salvador–Honduras). It's also a superimposed boundary because of the treaty put in place. "Sovereign Limits" states, "After a brief border-focused conflict in 1969, known as the Football War, Honduras and El Salvador committed to the delineation and demarcation of their boundary, which was made official in a 1980 Peace Treaty" (El Salvador–Honduras).
The boarder El Salvador shares with Guatemala is militarized. "Cispes.org" states, "Voices from El Salvador's social movement, civil society, municipal governments, and religious institutions joined together last week, supported by Salvadorans in the diaspora, to demand an end to the escalating military presence at the El Salvador–Honduras border. The recent increase of troops—supported by the U.S. government including through military and security funding—raises concerns about human rights violations, state violence, and the deepening incursion of the military into everyday life under the Bukele administration" (Diaspora Joins Border Communities in Chalatenango to Denounce Militarization).
The boarder El Salvador shares with Honduras is also militarized. This is in part due to their attempts to combat drugs traveling into the country. "InSight Crime" states, "El Salvador's President Nayib Bukele has increased army operations along the country's northern border with Honduras to combat transnational drug trafficking but this measure appears to overlook the primary entry points for cocaine...Since Bukele gave the order, the army has established five surveillance posts within the municipality of Arcatao alone, one of the most remote posts along the militarized border in Chalatenango, local mayor José Alberto Avelar told InSight Crime" (El Salvador's Odd Military Deployment to Stop Drugs at Honduras Border).