Qin dynasty
Note: King Zhaoxiang of Qin (秦昭襄王) had already been ruling Qin for 51 years when Qin annihilated the Zhou dynasty; however the other six warring states were still independent regimes. Some Chinese historiographers thus used the next year (the 52nd year of King Zhaoxiang of Qin) as the official succession from the Zhou dynasty.
The Qin Empire III
With the aid of the minister Fan Ju and general Bai Qi, King Zhaoxiang starts making aggressive advances against the other six states in the east. Under his rule, the Qin state destroys the Yiqu state, builds a section of the Great Wall, defeats the Qi and Chu states in battle, forces the Wei and Han states into submission, and inflicts a devastating defeat on the Zhao state at the Battle of Changping. After demonstrating its military power through its victories, in 256 BC the Qin state finally puts an end to the Eastern Zhou dynasty, the nominal suzerain power over the warring states. These events paved the way for the Qin state's eventual unification of China under the Qin dynasty within the next half-century.