A big reason the Chinese leader is pushing harder than ever to annex Taiwan is actually quite small. The self-governing island has an outsize manufacturing capacity for semiconductors – the little chips that bind the electrical circuits we use in our daily lives. Cell phones, laptops, modern cars, and even airplanes all rely on these tiny computer wafers. Taiwanese chip manufacturer TSMC alone makes more than half of the chips outsourced by all foreign companies, which means your iPhone likely runs on Taiwanese-made semiconductors. What would happen to the world's semiconductor chips if China were to take control of Taiwan?

Watch the episode of GZERO World with Ian Bremmer: What could spark a US-China war?