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Founding member of NATO, Significant for partial withdrawal from NATO's integrated military command in 1966

Year when Spain joined NATO, Significance: Enhanced NATO's southern European defense posture

Year when Greece and Turkey joined NATO, Significance: Strategic southern flank during the Cold War

Year when seven more countries joined NATO, Significance: Largest single expansion in NATO history

Founding member of NATO, Significant for leadership and military support

Founding member of NATO, Essential for its geographical position between Europe and the US

Founding member of NATO, Significant for sharing a border with Russia

Year NATO was founded, Significance: Response to the threat of Soviet aggression in Europe

Year when Poland, Hungary, and the Czech Republic joined NATO, Significance: NATO's first post-Cold War expansion eastwards

Founding member of NATO, Significant for its global influence and nuclear capabilities

Founding member of NATO, Significant for geographic position controlling the Mediterranean sea routes

Year when a unified Germany joined NATO, Significance: Germany was partitioned during the Cold War

Founding member of NATO, Significant for hosting the NATO headquarters

Year when Albania and Croatia joined NATO, Significance: Continued expansion of NATO into the Western Balkans