Advanced AI
is the warhead.
>requires concentrating that power with an infrastructure that a small group does not have, it requires coordinating the resources of a broad social base.
These are all things intelligence (artificial or otherwise) can help acquire. It listens, thinks, and responds. Genghis Khan, Adolf Hitler, and Albert Einstein are all intelligences that resulted in dramatic tangible, physical changes to our world almost entirely by listening, processing, and responding with human language.
A small number of slow and weak apes came to have absolute unilateral control over the destiny of all other lifeforms because of intelligence. The power, infrastructure, and resources you speak of were not available in 15,000 BCE, yet somehow they exist today.