1/ Why US need to protect Taiwan?
Taiwan has semiconductor manufacturer ability.
$TSM (Taiwan Semiconductor Manufacturing Company)the world's third largest after Intel and Samsung and the world's largest independent contract manufacturer of semiconductor products.
2/ Why US need to protect Taiwan?
$TPE Hon Hai Precision Industry Co., Ltd., trading as Hon Hai Technology Group in Taiwan, or Foxconn internationally is the World's largest electronic OEM provider and is the major OEM for Apple $AAPL
If Taiwan control by China, $AAPL will crash.
3/ Why US need to protect Taiwan?
Taiwan occupies an important geographical position, and all crude oil ships from the Middle East to South Korea and Japan must pass through Taiwan.