What alliance did Great Britain belong to?

Great Britain was a key member of several alliances throughout history, notably the Triple Entente, which included France and Russia prior to World War I. During World War II, it was part of the Allies, which included the United States, the Soviet Union, and various other nations opposing the Axis powers. Additionally, in the post-war period, Great Britain became a founding member of NATO (North Atlantic Treaty Organization) in 1949, a military alliance aimed at collective defense against potential threats.