Pelosi's Taiwan visit: Why is it such a big deal, and why is China so pissed?

Nancy's in town, and China ain't happy. Nancy Pelosi has stopped by Taiwan, and China's all angry about it. But why? On August 2, 2022, U.S. House Speaker Pelosi became the highest-ranking American to visit Taiwan in 25 years – a move which pissed off Chinese officials. For those unfamiliar with the situation, China …