some 15-20 years ago most of the big taiwanese electronics manufacturing companies (top tier x86-64 motherboard makers would be a good example) moved a lot of their factory operations to mainland china, for lower cost labor.

it's very interconnected now.

there's a fascinating yearly trade show of taiwanese manufacturers: https://www.computextaipei.com.tw/en/index.html

I frequently work with Taiwanese manufacturers in the industrial PC space. Depending on what the client needs, I can specify whether the equipment is made in China (Suzhou) or Taiwan. Having the equipment made in Taiwan costs at least 10 to 15% more.