US House Speaker Nancy Pelosi's visit to Taiwan sparked outrage across China.

　　Her trip was viewed by many as a violation of the one-China principle.

　　What is the one-China principle? Why such a strong reaction? And why does China maintain Taiwan is an inalienable part of its territory?

　　Let's break down the facts and take a brief look at history.

　　Host: Ian Goodrum

　　Video editor: Ma Chi, Yan Maoqiang, Cao Zinan

　　Supervisor: Wang Jianfen

　　Executive producer: Han Lei, Zhang Chunyan

　　Producer: Wang Hao

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