70: NATO

NATO has a total of 29 member countries. 14 of those member countries were once behind the Iron Curtain. 11 of those member countries were once part of the Warsaw Pact (the Communist version of NATO.) 3 of those member countries were once part of the Soviet Union (the reason NATO was created.)

NATO (with the United States taking the lead) won the Cold War and saw the collapse of Communism in Eastern Europe, the collapse of the Warsaw Pact and the collapse of the Soviet Union. 

Since the Cold War ended in 1991: NATO was/is in Bosnia (1992-2004), Serbia (1999), Kosovo (1999-Present), Afghanistan (2001-Present), Pakistan (2005-2006), Somalia (1999-2016), Yemen (1999-2016), Libya (2011) Iraq (2004-2011) and Turkey (2012-Present.)

Member Countries and date admitted:

April 4, 1949: the US, the UK, Belgium, Canada, Denmark, France (withdrew from 1966-2009), Iceland, Italy, Luxembourg, the Netherlands, Norway and Portugal.  

1952: Greece and Turkey      

1955: West Germany    

1982: Spain     

1990: East Germany (when it reunited with West Germany)

1999: the Czech Republic, Hungary and Poland   

2004: Bulgaria, Estonia, Latvia, Lithuania, Romania, Slovakia and Slovenia   

2009: Albania and Croatia    

 2017: Montenegro