Military alliances involving Canada

The North Atlantic Treaty Organization (NATO) is an intergovernmental military alliance between 32 member states—30 in Europe and two in North America. Founded in the aftermath of World War II, NATO was established with the signing of the North Atlantic Treaty in 1949. The organization serves as a system of collective security, whereby its independent member states agree to mutual defence in response to an attack by any outside party. This is enshrined in Article 5 of the treaty, which states that an armed attack against one member shall be considered an attack against them all.

grouping of the victorious countries of World War II

opposing side to the Central Powers in World War I

The North American Aerospace Defense Command (commonly abbreviated to NORAD NΟR-ad; ; ') is a bi-national mutual defense organization in Canada and the United States. Established 12 September 1957 as the North American Air Defense Command', NORAD is headquartered at Peterson Space Force Base in Colorado, which also serves as the headquarters of United States Northern Command (USNORTHCOM).