What was one way the Chinese tried to protect themselves during the Warring States period?
They created alliances with other nations.
They built barriers like the Great Wall of Qi.
They pitted feudal leaders against one another.
They fled the capital of Luoyang to avoid invaders.

They created alliances with other nations.

Explanation:

During this period Chou dynasty was ruling, but they only nominal power. That is why they created many alliances to keep themselves on power. Those were the famous horizontal and vertical alliances. This period lasted from 403 until 221 BC.

they both built pyramids.