Nothing today can throw any country back to a stone age than loss of access to microelectronics:
1. Loss of powerplants and the grid infrastructure - possible to rebuild, and immediate impact is not catastrophic
2. Loss of food supply stocks - unless, you are blockaded, you can just buy abroad
3. Loss of fertilizer stocks - just as survivable as loss of food supply.
4. Loss of hydrocarbon supply - an even more laughable national emergency.
5. Heavy industry - just rebuild, you can wholly rebuild it with pre-industrial tech level.
6. Loss of microelectronics - you fc*ked - to make microchips, you need more microchips, and to build those microchips, you need a ton of other microchips. You achieve nothing if you manage to replicate the technology of the era of first ICs.