▁weak ened ▁when ▁the ▁Japanese ▁invas ions ▁of ▁Korea ▁in ▁the ▁ 1 5 9 0 s ▁and ▁the ▁first ▁and ▁second ▁Man ch u ▁invas ions ▁in ▁ 1 6 2 7 ▁and ▁ 1 6 3 6 – 1 6 3 7 ▁nearly ▁over ran ▁the ▁Korean ▁Pen ins ula , ▁leading ▁to ▁an ▁increasing ly ▁har sh ▁isol ation ist ▁policy , ▁for ▁which ▁the ▁country ▁became ▁known ▁as ▁the ▁" h erm it ▁kingdom " ▁in ▁Western ▁literature . ▁After ▁the ▁end ▁of ▁invas ions ▁from ▁Man ch uria , ▁Jose on ▁experienced ▁a ▁nearly ▁ 2 0 0 - year ▁period ▁of ▁peace , ▁prosper ity , ▁cultural , ▁and ▁techn ological ▁development . ▁ ▁However , ▁whatever ▁power ▁the ▁kingdom ▁recovered ▁during ▁its ▁isol ation ▁further ▁w an ed ▁as ▁the ▁ 1 8 th ▁century ▁came ▁to ▁a ▁close , ▁and ▁faced ▁with ▁internal ▁str ife , ▁power ▁strugg les , ▁international ▁pressure ▁and ▁re bell ions ▁at ▁home , ▁the ▁Jose on ▁dynast y ▁decl ined ▁rapidly ▁in ▁the ▁late ▁ 1 9 th ▁century . ▁ ▁The ▁Jose on ▁period ▁has ▁left ▁a ▁substantial ▁legacy ▁to ▁modern ▁Korea ; ▁much ▁of ▁modern ▁Korean ▁culture , ▁et iqu ette , ▁norm s , ▁and ▁soci etal ▁att itudes ▁towards ▁current ▁issues , ▁and ▁the ▁modern ▁Korean ▁language ▁and ▁its ▁dialect s , ▁derive ▁from ▁the ▁culture ▁and ▁trad itions ▁of ▁Jose on . ▁ ▁History ▁ ▁Early ▁Jose on ▁period ▁ ▁Found ing ▁ ▁By