Way History: ‪9nm line‬ (‪199975241‬)

Way History: 9nm line (199975241)

adding a US relation for 1803-1819 as an anchor point for further refinement

boundary	administrative
maritime	yes
name	9nm line
source	https://geodata.bts.gov/datasets/usdot::time-zones/

converting NH relations to maritime boundaries

boundary	administrative
maritime	yes
name	3nm line
source	https://geodata.bts.gov/datasets/usdot::time-zones/

Added Central Time Zone boundary, conflating w/ existing boundaries where available

source	https://geodata.bts.gov/datasets/usdot::time-zones/

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