Which alliance is a political and military alliance between Canada, the U.S., and Western Europe for defense, with the slogan 'An attack against one, is an attack against all'?

Which alliance is a political and military alliance between Canada, the U.S., and Western Europe for defense, with the slogan 'An attack against one, is an attack against all'?

• A. NATO
• B. EU
• C. UN
• D. OAS

Answer: (C)

The key idea here is collective defense within a military alliance. The slogan “An attack against one is an attack against all” describes how member states commit to defend each other when faced with aggression. This is a hallmark of NATO, the North Atlantic Treaty Organization, founded in 1949 by the United States, Canada, and Western European countries to deter and respond to threats. Under Article 5, an armed attack on one member is regarded as an attack on all, prompting a collective response from the alliance. The other options don’t fit this exact arrangement. The European Union is a political and economic bloc, not a formal mutual-defense treaty that automatically obligates member states to defend each other. The United Nations is a global organization with peacekeeping and security mechanisms, but it doesn’t have a blanket mutual-defense pledge like NATO. The Organization of American States covers states in the Western Hemisphere, not Western Europe. Therefore, the alliance described is NATO.

The key idea here is collective defense within a military alliance. The slogan “An attack against one is an attack against all” describes how member states commit to defend each other when faced with aggression. This is a hallmark of NATO, the North Atlantic Treaty Organization, founded in 1949 by the United States, Canada, and Western European countries to deter and respond to threats. Under Article 5, an armed attack on one member is regarded as an attack on all, prompting a collective response from the alliance.

The other options don’t fit this exact arrangement. The European Union is a political and economic bloc, not a formal mutual-defense treaty that automatically obligates member states to defend each other. The United Nations is a global organization with peacekeeping and security mechanisms, but it doesn’t have a blanket mutual-defense pledge like NATO. The Organization of American States covers states in the Western Hemisphere, not Western Europe. Therefore, the alliance described is NATO.