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 War of 1812 saw 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.