What is the Indian Stream Republic?

Indian Stream Republic bounded by the Connecticut River and three of the Connecticut Lakes on the south and east, by the Highlands on the north, and Halls Stream on the west, came into being in 1832 due to uncertainty about which stream was "the northernmost head of the Connecticut River"--and with neither the US nor Canada exercising effective jurisdiction over the area. The existence of the republic was ended by New Hampshire in 1835, and Halls Stream was designated as the boundary by the Webster -Ashburton Treaty of 1842.
(Source: Atlas of American History, 2nd revised edition, New York: Charles Scribner's Sons, 1984 p. 132)

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