Sapiens -

This allowed us to cooperate in large numbers (more than the ~150 natural limit for a tribe). The Agricultural Revolution (12,000 years ago):

If you are playing the colony simulator game Sapiens , your first goal is to ensure your tribe survives its first winter. Sapiens

If you are reading Yuval Noah Harari's book, the narrative is split into four major "revolutions" that shaped our species. This allowed us to cooperate in large numbers