Welcome. This is the discussion space attached to the History Atlas, organized around seven standard eras whose own boundaries are honestly debated rather than treated as fixed. The aim throughout is what happened and how that came to be known. A few house rules: keep a disagreement about evidence rather than about people, and cite what you can.
The atlas itself is still being built. Every room below carries an opening note from the curator to start it off, and you are welcome to open your own thread on anything those rooms cover, or to use this room for whatever does not fit a narrower one.