Canada-United Kingdom relations (French: Relations entre le Canada et le Royaume-Uni) are the bilateral relations between Canada and the United Kingdom. The relations between the two countries have had intimate and frequently-co-operative contact. Both are related by mutual migration, through shared military history, a shared system of government, the English language, the Commonwealth of Nations, and their sharing of the same head of state, Queen Elizabeth II. Despite the shared legacy, the two nations have grown apart economically and politically. Britain has not been Canada's largest trading partner since the 19th century. However, both share a defence agreement, NATO, and frequently perform military exercises, together with Canada hosting the largest British Military Base outside the U