In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

The aristocratic Fourteen Families survived the crash of this country's indigo industry by slavedriving their way into coffee-producing wealth, while its natoional tradition venerates the Pipil warriors who repelled Pedro de Alvorado. Occult enthusiast Maximiliano Hernandez Martinez responded to Farabundo Marti's 1932 peasant uprising in this country by initiating a brutally systematic mass murder of its citizens known as "the slaughter, or la matanza. Roberto D'Aubuisson, the founder of this country's ARENA party, was revealed to be incurably genocidal and implicated in the deaths of Rutilio Grande and Archbishop Oscar Romero. Tensions over the border near the Gulf of Fonseca were ignited by a 1970 FIFA qualifying match, leading this country and Honduras to fight the soccer war. For 10 points, name this Central American country with capital at San Salvador.
History

Seas of calcite predominate during times of low concentration of this element. The NIMS probe discovered that Ganymede has a sulfate of this element, which is also used to treat eclampsia. Its molten form is used to make metallic titanium in the Kroll process. The active site of rubisco contains a carbamylated lysine attached to an ion of this element. Its cationic form is used to stabilize the product of PCR, and it is also prevalent in certain reagents in a Schlenck equilibrium. It is found in Grignard reagents as well as coordinated to the porphyrin ring of chlorophyll. For 10 points, name this element with atomic number 12 and symbol Mg.
Science

Brodsky and Berman determined this chemical's structure, which includes a sheath of stabilizing ordered water molecules. Due its dearth of cysteine residues, cross-linking of occurs near the N- and C-termini between lysine and histidine residues with the aid of lysyl oxidase. Ascorbate is dietarily necessary because it is needed by the enzyme prolyl hydroxylase, which forms one of this molecule's prevalent residues. Consisting of over thirty distinct chains assembled into at least nineteen different varieties, the most common residue sequence is glycine-proline-hydroxyproline. FTP, name this triple-helical protein, the most abundant in vertebrates, that provides tensile strength in tissues like tendon, teeth, and bone.

Science