The article discusses disputes regarding the northeast border of the U.S. The author notes the lack of definition of the border in treaties between the U.S. and Great Britain and comments on how the St. Croix River empties into an estuary which makes the border between Maine and New Brunswick unclear. A charter made by English king James I to territory in America conflicted with a land grant from French king Henry IV to explorer Pierre Dugua de Monts. Following the U.S. Revolutionary War, conflicts rose over the true course of the St. Croix, leading to the appointment of a commission that failed to resolve the dispute. Disputes over the ownership of Moose Island during the War of 1812 and a dispute over fishing in Passamaquoddy Bay are also noted.