What Satya doesn't know yet.
A teacher who is surprised mid-class doesn't come back. A teacher told in advance forgives it.
Satya only speaks from a sourced record — that's the whole premise. This page is the same honesty pointed at itself: what the record actually covers right now, what it doesn't yet, and why. Nothing below is a promise about the future; it's a snapshot of today.
Spanning 1526–1960, two chapters — India and California. Counts update as the substrate grows — see About for the full breakdown.
What's actually teachable right now
Two walked chapters exist for the pilot, Grade 4 (HSS 4.2–4.3): Spanish missions (1769–1821) and the Gold Rush through statehood (1848–1851) — each a step-by- step page you can run a class through start to finish. Mexican-era ranchos (1821–1848) and a curated slice of 1863–1979 (the railroad and Chinese Exclusion, WWII incarceration, the water system, the 1878–79 constitutional convention) exist as real, sourced events and entities on the map — draw a box over them and Satya answers from them — but neither has an authored walk-through chapter yet, the same gap named for grades 5–8 below. India, 1526–1947, is Satya's original chapter — real and citable, but not part of this pilot's lesson plan.
What isn't here yet
- Grade levelOnly Grade 4 California history is lesson-ready. Grades 5–8 have no authored content — the map itself still works if you draw a box anywhere else on Earth, but nothing walks a class through it.
- GeographyOutside India and California, coverage is real but thin — borders and rulers where the underlying data exists, large stretches of the globe where it doesn't. Sub-Saharan Africa before 1500 and the pre-Columbian Americas are the two biggest known gaps: open historical GIS data is genuinely sparse there, not a Satya choice.
- ConsultationSome California Indigenous content is deliberately incomplete on purpose, not by oversight. The Gold Rush chapter states the 1850 Clear Lake killings and their death toll — genuinely disputed among sources, and Satya reports the range rather than picking a number — but does not name which living descendant band the survivors belong to, and does not tell a specific family's story reported to a journalist rather than to this project. Both await real tribal consultation before they're added, not before they're removed.
- CertaintyEvery fact carries a confidence tag — attested, probable, traditional, or legendary. Disputed figures (like Clear Lake's death toll, reported between about 60 and 800 depending on the source) render as a stated range, never merged into one falsely-precise number.
- BordersTerritory shapes come from real historical snapshots, simplified for performance, at specific years — the smooth animation between two snapshot years is a visual interpolation, not a claim about where a border actually ran in the years between. Frontiers in most of this period were zones of influence, not surveyed lines.
Why say this at all?
Because the alternative is a teacher finding a gap live, in front of a class, with no warning. Satya can do this because thinness is modeled, not hidden — every honest limit shown on the map itself (a "no sources here yet" line, a disputed-figure range, an unmapped-border capital point) is the same mechanism this page just describes in one place. Nothing here is invented for the page; it restates what the app already says.