As for the nuclear war being a solution — it's possible, but I have recently dimmed on this prospect. Most of our modern technologies are are not merely of a scientific or even engineering-related nature, but of logistical and organizational kind. You can't have SOA weaponry without SOA semiconductors, which you can't have without the single most complex and globalized supply chain in human history. Even for Cold War era technology, you need at least an extremely centralized state numbering in the hundreds of millions with vast foreign dependencies and immense home territories.