Go-Joseon was the earliest state in East Asia, established in 30C, -24Century BC. The formation of agrarian society and beginning of metal culture of the Bronze age constituted two major socio-economic and technological factors behind the rise of Go-Joseon. Bronze Age metal culture developed in the Asadal province of the Korean peninsula which was the capital region during the formative phase of the Go-Joseon state between 31 C.-24 Century BC. More than 13 artifacts of this period have been discovered in archaeological excavations. Formation of the Go-Joseon state and the beginning of Bronze Age metal culture occurred and developed simultaneously. Bronze Age metal culture of Go Joseon was formed in the Asadal region, but subsequently in 20 Century BC it was transferred to the Liaodong peninsula, and the state attained further maturity in the original region of the Korean peninsula and the adjacent Manchurian region of Liaodong and Liaoxi where it spread.
The Bronze Age culture of Go-Joseon was disseminated in ancient China after some of the Go-Joseon people migrated to this area between 20 C and 16 C BC. Designs of the Bronze Age metal culture of Go-Joseon are sharply different from those of ancient China and Northern Siberia so that it is easy to make a clear distinction. Mandolin-shaped bronze dagger, mandolin-shaped bronze spearhead, slender bronze daggers. Bronze axe, Multi-knob mirror with coarse Lines. Go-Joseon style Bronze helmet, bronze artifacts with thunderbolt pattern, bronze artifacts with sun-pattern, ritual bronze vessels etc may be cited as the representative and characteristic examples of the Go-Joseon design.
These relics of Go-Joseon metal culture have been found at several places on the Korean peninsula, and their discovery at Liaodong and Liaoxi regions of Manchuria and Chifeng region of Inner Monglia indicates that they were part of the territorial expanse and cultural zone of the Go-Joseon state.