Answered by Kina from Singapore | Jun. 13, 2014 01:28
Materials: stone, bricks, earth even wood.
Who: With the order of the emperors, soldies, peasants, slaves, prisoners and common people were engaged in building the wall.
When: the construction of the wall lasted for about 2,000 years. According to the records, the earliest sections were made during the warring states period. During Qin Dynasty, Qin Shihuang ordered to join the former sections. The latest and best preserved ones were made in Ming Dynasty.