NATO · US History

The first and only time Article 5 of the NATO Treaty was invoked was in response to:

  1. The Soviet invasion of Hungary in 1956
  2. The construction of the Berlin Wall in 1961
  3. The North Korean invasion of South Korea in 1950, which started the Korean War
  4. The September 11, 2001, terrorist attacks on the United States
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Correct answer: The September 11, 2001, terrorist attacks on the United States

Following the 9/11 attacks, NATO allies declared that the attack on the U.S. was an attack on all. This led to NATO’s involvement in air patrols over the U.S. and eventually the mission in Afghanistan.

Difficulty: Medium Question 18 of 20

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