I know these would e controversial but here it goes: 1. You want fabs in a country where IP laws are protected so third parties don't get their designs stolen.

I know these would e controversial but here it goes: 1. You want fabs in a country where IP laws are protected so third parties don't get their designs stolen. 2. Critical tech from a military/trade perspective. 3. Other governments don't get to introduce secret low-level artifacts such as microcode into chips which runs whole world. 4. General availability of a higher level of capital for research. 5. The confluence of talent from all over the world can contribute to state of the art advancement.