References 150% CONFIDENCEOverall confidence: 50%How well the pin's source and references back up its dates.Weighted average of how firmly 1 reference, the source included, supports the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins from 50% to 74% confidence

The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.

• [1]50%
  datacenters.google/locations/tennessee

  datacenters.google· Posted Oct 10, 2026· Starts Jan 1, 2019 ✓· 100% of score

  Opening: approximate calendar placement from the published year, month, or season; the selected day is a placeholder, not a verified event day.

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