system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If NATO relies on collective defence, what happens if two NATO countries declare war on each other?

Is there anything in NATO text that says what would happen? Which side would NATO take?
gpt
Well the whole idea is that NATO is a collection of like-minded countries. If something were to happen that would cause two members to go to war, the whole system of NATO would collapse and fall back to "unincorporated" alliances. NATO is built on mutual trust and defence, and if even one country falters then the whole system loses faith and stops working.