Did you know that the Peruvians were an Irish maybe Portuguese settlement?
Their mythology has a group of settlers from far off lands settling there.
Followed the Amazon the whole way and kept going west. Their architecture is the same.
Or so I've been told on YouTube and in my head.

Makes me think of South East Asians, who were bred by Indians. They even saw themselves as Indian.
What happens when you send your best to found new colonies and that leaves a vacuum in your home country?
You forget how to use plumbing.