Because politicians have realized that semiconductor manufacturing capability is especially critical to our national security and prosperity. Having the bulk o

Because politicians have realized that semiconductor manufacturing capability is especially critical to our national security and prosperity. Having the bulk of it located overseas is risky during a time of war and potentially provides unacceptable economic leverage to others during a time of peace. It’s the same reason why we have massive farm subsidies. A lower tax rate for corporations altogether would also incentivize the relocation of noncrucial capability. Limiting the incentive to critical capability is less expensive.