formed between 26 nations to enforce
of 1949. NATO was originally formed to combat the spread
, but has grown since then to provide
defense from external threats. As of 2008, NATO is made up of these nations: Belgium, Bulgaria, Canada, the Czech Republic, Denmark, Estonia, France, Germany, Greece, Hungary, Iceland, Italy, Latvia, Lithuania, Luxembourg, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Turkey, United Kingdom, and the United States
. The organization
is headquartered in Brussels, Belgium.