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three navive kigdoms in power koguryo, paekche ,and silla
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buddhism comes tokorean peninsula from china
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first astronomcal observatory in asia
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silla kingdom unites all korea time of peace and culture.
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koryo kingdom replaces the silla source of the name korea
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artisan carve all buddhist books on wooden blockes to be used in printing.
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koreans invent rain guage,barometer, iron,hanging brigde ,ironclad,warship,and metal movable type