Press play. Each group or idea will appear here as it shows up on the map: one square per entry, its color telling you which family it came from.
The record is not evenly kept, and neither is this list: 107 entries from two millennia are a curation, drafted by Claude from general knowledge in July 2026. The 96 data- and scholarship-backed entries were search-fact-checked in August 2026 (92 supported outright, 4 corrected); the claude-comment entries below are editorial judgment, not fact-checked. Extreme here does not require violence: it means one-dimensional: a politics that ranks a single consideration above every other practical one and cannot see the world along any other axis; violence is a subcategory, not the definition. Inclusion is not equivalence: this map holds the Khmer Rouge and movements that never hurt anyone; the stamps and blurbs carry the differences. Entries no dataset supports wear a mustard claude comment stamp with the reasoning on the card, so you can disagree with the judgment rather than mistake it for data.
The word each era used for extremism
occurrences per billion words, English books, 1800 to 2019The ledger
All 107 entries, oldest first, with their stamps.
Every entry carries an influence rating — Claude's judgment of how far its effect reached.
- 1 · contained Mostly influenced its own members.
- 2 · local influence Shaped its city, country or region for a time.
- 3 · changed history Changed the course of history.