Time-Lapse Map Shows NATO's Expansion Over the Years

Over the past 75 years, NATO has broadly expanded its reach, as 32 member nations are now united for a common cause in the military alliance. On Thursday, NATO will mark its 75th anniversary, with the organization saying that it's celebrating several decades of "collective defense." "Since its creation on 4 April 1949, the transatlantic Alliance has grown from 12 founding members to 32 member countries, all working together to keep our people safe. A community of Allies bound together …