Beginning in 1200 b. c.e., what new technology entered china?

The correct answer is chariots

In ancient China, chariots were used as a means of transporting infantry and weapons across the Battlefields. They provided the soldiers with an advantage through increased mobility and as such featured prominently as battle vehicles.  

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.