Editing Horseshoe Falls (section)

==International border==
[[File:Niagara-boundary-1819.jpg|right|thumb|1819 Boundary Commission map of the International Boundary Line cutting through Horseshoe Falls]]

When the boundary line between the United States and Canada was determined in 1819, based on the [[Treaty of Ghent]], the northeastern end of the Horseshoe Falls was in [[New York (state)|New York]], United States, flowing around the Terrapin Rocks, which were once connected to [[Goat Island (New York)|Goat Island]] by a series of bridges. In 1955, the area between the rocks and Goat Island was filled in, creating [[Terrapin Point]].<ref name=berton>{{cite book |last= Berton |first= Pierre |title= Niagara: A History of the Falls |url= https://books.google.com/books?id=P_Rr06A2H6UC&pg=PA20 |access-date= December 1, 2010 |year= 2009 |publisher= SUNY Press |isbn= 978-1-4384-2928-1 |pages=20–21}}</ref> In the early 1980s the [[United States Army Corps of Engineers]] filled in more land and built diversion dams and retaining walls to force the water away from Terrapin Point. Altogether, {{convert|400|ft|m|abbr=on}} of the Horseshoe Falls was eliminated. Due to erosion, the Falls will continue to move in relation to the boundary line in the future, possibly altering territorial boundaries between the two countries.

The official national maps for both Canada and the United States indicate that a smaller portion of the Horseshoe Falls currently is located within the United States.<ref>{{cite web | title = The Atlas of Canada | date = September 12, 2016 | publisher = Government of Canada |url=http://atlas.gc.ca/toporama/en/index.html?id=map1&extent=1317001.3341982635,-501305.9605510465,1318807.9128114209,-500353.4586460427&legend=762eb7ed-0001-242f-6fcf-af08f5605eb1,0,0,1;e5511402-0002-5cbe-0d3c-f537c612b7df,0,0,0.7;cc7fde4c-0003-1cf2-8358-7ca86eefb13c,0,0,1;762eb7ed-cccc-242f-6fcf-af08f5605eb1,0,1,1;8a57b0ba-c004-f03d-7cd4-b3d9b35a8b83,0,0,1;4118b52e-66fe-6b4d-b826-a8f309338f76,0,0,1;e5511402-0029-5cbe-0d3c-f537c612b7dg,0,0,1;e5511402-0029-5cbe-0d3c-f537c612b7df,0,1,1;e5511402-0028-5cbe-0d3c-f537c612b7df,0,0,1;e5511402-0628-5cbe-0d3c-f537c612b7df,0,1,1;e5511402-0528-5cbe-0d3c-f537c612b7df,0,1,1;8a9bb0ab-0005-32b1-6715-be42194945aa,0,0,1;e5511402-0027-5cbe-0d3c-f537c612b7df,0,1,1;e5511402-0026-5cbe-0d3c-f537c612b7df,0,1,1;e5511402-0025-5cbe-0d3c-f537c612b7df,0,1,1;8a9bb0ab-0021-32b1-6715-be42194945aa,0,1,1;e5511402-0023-5cbe-0d3c-f537c612b7df,0,1,1;e5511402-0022-5cbe-0d3c-f537c612b7df,0,1,1;8a9bb0ab-0018-32b1-6715-be42194945aa,0,1,1;e5511402-0020-5cbe-0d3c-f537c612b7df,0,1,1;e5511402-0019-5cbe-0d3c-f537c612b7df,0,1,1;8a9bb0ab-0014-32b1-6715-be42194945aa,0,1,1;e5511402-0017-5cbe-0d3c-f537c612b7df,0,1,1;e5511402-0016-5cbe-0d3c-f537c612b7df,0,1,1;e5511402-0015-5cbe-0d3c-f537c612b7df,0,1,1;8a9bb0ab-0010-32b1-6715-be42194945aa,0,1,1;e5511402-0013-5cbe-0d3c-f537c612b7df,0,1,1;e5511402-0012-5cbe-0d3c-f537c612b7df,0,1,1;e5511402-0011-5cbe-0d3c-f537c612b7de,0,1,1;e5511402-0011-5cbe-0d3c-f537c612b7df,0,1,1;e5511402-0009-5cbe-0d3c-f537c612b7df,0,1,1;e5511402-0007-5cbe-0d3c-f537c612b7df,0,1,1;e5511402-0004-5cbe-0d3c-f537c612b7df,0,1,1 | access-date = February 19, 2017}}</ref><ref>{{cite web | title = National Map of the United States | publisher = United States Geological Survey | url = https://viewer.nationalmap.gov/basic/?basemap=b1&category=nbd,ned,nedsrc,histtopo,nhd,hro,naip,nbdmi,gnis,nlcd,smallscale,nsd,vectorcmb,ntd,ustopo,woodland&q=&zoom=17&bbox=-79.07926798,43.07932680,-79.07132864,43.08171686&preview=&avail=&refpoly= | access-date = February 19, 2017}}</ref>