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Relations between Canada and the United States of America have spanned more than two centuries. This includes a shared British cultural heritage, and the development of one of the most stable and mutually-beneficial international relationships in the world. Each is the other's chief economic partner. Tourism and migration between the two nations have increased rapport. The U.S. is ten times larger in population and is by far the dominant partner in terms of cultural and economic influence. Starting with the American Revolution, a vocal element in Canada has warned against American dominance or annexation. The most serious occurred during the War of 1812, with invasions across the border. In 1815, the war ended with the border unchanged and demilitarized, as were the Great Lakes. Furthermore, the British ceased aiding First Nation attacks on American territory, and the United States never again attempted to invade Canada. Apart from minor raids, it has remained peaceful.〔John Herd Thompson, ''Canada and the United States: ambivalent allies'' (2008).〕 As Britain decided to disengage, fears of an American takeover played a role in the formation of the Dominion of Canada (1867), and Canada's rejection of free trade (1911). Military collaboration was close during World War II and continued throughout the Cold War on both a bilateral basis through NORAD and through multilateral participation in NATO. A very high volume of trade and migration continues between the two nations, as well as a heavy overlapping of popular and elite culture, a dynamic which has generated closer ties, especially after the signing of the Canada–United States Free Trade Agreement in 1988. Canada and the United States are currently the world's largest independently sovereign trading partners.〔See (2009 data )〕 The two nations share the world's longest border,〔(【引用サイトリンク】title=The world's longest border )〕 and have significant interoperability within the defence sphere. Recent difficulties have included repeated trade disputes, environmental concerns, Canadian concern for the future of oil exports, and issues of illegal immigration and the threat of perceived terrorism. Nevertheless, trade has continued to expand, especially following the 1988 FTA and North American Free Trade Agreement (NAFTA) in 1994 which has further merged the two economies.〔Hills, Carla A. "NAFTA's Economic Upsides: The View from the United States." ''Foreign Affairs'' 93 (2014): 122.〕〔Michael Wilson, "NAFTA's Unfinished Business: The View from Canada." ''Foreign Affairs'' (2014) 93#1 pp: 128+.〕 The foreign policies of the neighbours have been closely aligned since the Cold War. However, Canada has disagreed with American policies regarding the Vietnam War, the status of Cuba, the Iraq War, Missile Defense, and the War on Terrorism. A diplomatic debate has been underway in recent years on whether the Northwest Passage is in international waters or under Canadian sovereignty. According to Gallup's annual public opinion polls, Canada has consistently been Americans' favorite nation, with 96% of Americans viewing Canada favorably in 2012.〔 published in 2010.〕〔(Americans Give Record-High Ratings to Several U.S. Allies ) ''Gallup''〕 According to a 2013 BBC World Service Poll, 84% of Americans view their northern neighbor's influence positively, with only 5% expressing a negative view, the most favorable perception of Canada in the world. As of spring 2013, 64% of Canadians had a favorable view of the U.S. and 81% expressed confidence in Obama to do the right thing in international matters. According to the same poll, 30% viewed the U.S. negatively.〔See 〕 ==Country comparison== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Canada–United States relations」の詳細全文を読む スポンサード リンク
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