@adrianhon Toronto, My home town, had a large city-block-sized "Adventure Playground."
Located opposite and across the small channel from Downtown Toronto's present day Island Airport.
All the childhood "politics" and self-governance and collective self-agency you describe throughout this thread existed.
I experienced and witnessed much of it.
In true Toronto-ish municipal culture,
The Adventure Playground was split into two:
One for kids aged ~12-16,
+ smaller one for younger kids ~7-15.