The Three Kingdoms of Korea were eventually under one rule after Silla and the Chinese Tang Dynasty forces had taken over Koguryo and Peakju. The Chinese tried to take control over the territories of the fallen kingdoms.
Silla launched attacks on the Chinese in the following years defeating them in the north despite attacks from the Chinese in Silla. The Chinese were eventually driven out of the Korean peninsula by 676 AD resulting in a unification of the Three Kingdoms. This unification of Silla lasted for over 260 years until descendents of Koguryo and Peakje started rebellious movements. Silla was eventually replaced by the Koryo Dynasty.
Please click here to go from our page on the Unification of the Three Kingdoms of Korea under Silla to our section on one of the most fortified border in the world, the DMZ.