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- The Erie Triangle is a tract of American land that was the subject of several competing colonial-era claims and which was eventually acquired by the U.S. federal government and sold to Pennsylvania so that the state would have access to a freshwater port on Lake Erie. The Erie Triangle land makes up a large portion of present-day Erie County, Pennsylvania. Most of northwestern Pennsylvania came under Anglo-American control following the 1784 Treaty of Fort Stanwix with the Iroquois Confederacy. The following year, a boundary dispute between New York and Pennsylvania erupted. Following a surveying effort by Andrew Ellicott representing the Pennsylvanians and James Clinton and Simeon DeWitt representing the New Yorkers, the western edge of New York was set at 20 miles (32 km) east of Pennsylvania's Presque Isle, a small peninsula off the coast of Erie, Pennsylvania. However, this left an unclaimed area, which came to be known as the Triangle Lands. The Triangle Lands problematically fell under neither New York nor Pennsylvania's charter, while both Connecticut and Massachusetts also spoke up with claims derived from their original colonial sea-to-sea grants. Of these four competing claimants (Pennsylvania, New York, Connecticut, and Massachusetts), only Pennsylvania was landlocked. Following some pressure from the new federal government, all four states surrendered their claims to that entity, which then, in 1792, turned around and sold final rights to the 202,187 acres (818.22 km²) of land to Pennsylvania for $151,640.25 (75 ¢/acre). The Six Nations of the Iroquois Confederacy released the land to Pennsylvania in January 1789 for payments of $2,000 from Pennsylvania and $1,200 from the federal government. The Seneca Nation separately settled land claims against Pennsylvania in February 1791 for the sum of $800. With this access to the Great Lakes, Pennsylvania could be persuaded to accept a western boundary located considerably farther east than it would otherwise want—possibly as far west as present-day Cleveland, Ohio. The Erie Triangle is often described as a "tab" or "chimney" attached to the Keystone State. The water off the coast of the Erie Triangle is known as the Graveyard of Lake Erie because of the large number of shipwrecks that occurred in the area's stormy waters in the 18th and 19th centuries. It was also the site of a preliminary battle between forces that participated in the Battle of Lake Erie during the War of 1812. The battle itself took place in the Lake Erie Islands, at the western end of the lake, off the coast of Ohio.
- エリー・トライアングル（Erie Triangle）は、植民地時代の主張で度々争われていたアメリカ合衆国の土地の一区域。最終的には合衆国連邦政府が獲得して、エリー湖上の淡水港にアクセスできるようにペンシルベニア州にこの土地を売った。エリー・トライアングルの土地は現在のエリー郡の大部分を占める。
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