# Era 5 - Oil, Electricity, Plastics

Era 5 is the first playable post-industrial step.

- Core chain: oil -> fuel/plastics -> electricity -> electronics.
- Homes unlock level 7 through electronics as the new lifestyle need.
- Battle units add motorized riflemen and armored cars through the existing barracks flow.
- Era 6 rows are present in the same graph so the next catalog loads safely and the singularity target is visible.
