# Who Really Shapes American Conversations Over Time

> Published on ADIN (https://adin.chat/s/american-discourse-centralization-trends-m2ia)
> Type: Chart
> Date: 2026-03-18
> Description: Explore how control of U.S. discourse shifts by city concentration and geographic reach across different eras.

Chart type: bar
X-axis: era
Y-axes: top_3_cities_control, geographic_spread
Data points: 2