Explain what some parts of the world were like about 800 years ago (examples could be China, the Middle East, Western Europe, Mexico, etc.)

800 years ago in China; the Genghis Khan invaded the Western Xia Dynasty in China and established the Yuan Dynasty

800 years ago in the Middle East; Sultan al-Kamil who was a brother of Saladin, offers Jerusalem to the Crusaders for ten years in return for Damietta, which the Crusaders eventually give up, in exchange for a safe retreat from the Nile Delta.

800 years ago in Western Europe; The Jews of Erfurt, Germany are massacred, after a ritual murder libel. A crowd storms the synagogue where the Jews have gathered. The threat is baptism or death. The Jewish quarter, including the synagogue, is razed; many Jews were tortured and killed.

800 years ago; The Maya of the Yucatán revolt against the rulers of Chichen Itza.

just some examples, hope i helped