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Three Nations
After the fall of Ancient Joseon, agriculture was further developed based on the bronze culture; consolidating the economic base. With such development, many wars were waged by nations aspiring to expand their reach, and industries clearly started to diversify. Against this backdrop, the three nations of Goguryeo , Baekje , Silla were established. Goguryeo, which was founded in the first century, brought numerous tribes under its control and was centered around the Abnok River. In early 4th century, it drove out Nakrang county and advanced into the Daedong River area. The Baekje nation rose near the Han River, with the Wiryeseong at its center. It secured systems for an ancient nation by the 3rd century, and enjoyed political development.
Meanwhile, Silla, which was established in the Gyeongju plain, conquered the surrounding areas in the 4th century and the King strengthened his grip on the area. Along with these nations, Gaya was established on the lower Nakdong River, but did not develop into a nation and was absorbed into Silla in the 6th century. The three nations prospered while they competed with each other; Goguryeo in particular, recorded dramatic development. By the 5th century, Goguryeo developed into a large nation, expanding to the Songhwa River to the north, Asan Bay and Jungnyeong to the south. It also spanned from the east coast to the Ryaoho River. It moved its capital from small Guknaeseong to Pyeongyangseong; here they further consolidated political and economic systems and developed a distinctive culture.