Google Maps renames Lake Ontario to "Lake America" by August 31, 2026?
Crossbook compares what two exchanges, Polymarket and Kalshi, charge for the same event, and publishes a permanent scored record of its own forecasts under published rules.
Tracked on one venue, with Crossbook's own call on the record.
Crossbook forecast
- 3.0%against a market price of 29.0% at the timeYES
Logged 28 Aug 2026, 16:30 UTC · Brier 0.9409
- No executive order, IHO decision, or USGS/GNIS change renaming Lake Ontario exists or has been credibly proposed; renaming it would also require Canadian-side complications absent in the Gulf case, making spontaneous action by Google in 3 days near-implausible.
- Time decay is decisive: with ~3 days to resolution, even a surprise executive order today would almost certainly not propagate to the majority of US Google Maps users by Aug 31, given the ~1-2 week lag observed for Gulf of America.
- The 29% market price vs my ~3% estimate is best explained by narrative momentum from the Gulf of America precedent and low-liquidity meme trading, not by any concrete signal of an impending rename.
What would change it: A signed executive order or official USGS/Board on Geographic Names decision renaming Lake Ontario in the next 72 hours, which would raise my estimate substantially though implementation lag would still cap it.
Settlement source
Context
Polymarket prices this at 38%. No verified equivalent is currently listed on the other venue, so there is no cross venue comparison on this page.
Volume over the last 24 hours is active, at about $131,970 on the busier venue.
This market has settled. The page is kept as a record of what the market said while the question was open, and of what Crossbook called.
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