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.
Q: This country's K5 Plan attempted to seal its western border by constructing a minefield known as the Bamboo Curtain. This country's "dark ages" saw its capital at Longvek captured by Ayutthaya. Its temple mountain of Bakong was constructed by Indravarman I, who led an empire founded by Jayavarman II. UNTAC restored peace in this country, which entered into a civil war soon after Norodom Sihanouk was deposed by (*) Lon Nol. That period of strife saw currency abolished, "year zero" established by Brother Number One, and land mines placed around Angkor Wat. For ten points, identify this country where Pol Pot once led the Khmer Rouge.
A:
History