Why NATO collective defence did not cover the Falklands

Why did NATO Article Five not apply when Argentina invaded the Falkland Islands?

The Falklands lie outside NATO's defined treaty area; the panel relates that boundary to reluctance to assume imperial policing commitments.

NATO's collective-defence commitments operate within a defined geographic area. The Falklands fall outside the treaty area described in the answer. The panel connects that limit to American reluctance to become involved in the European powers' imperial policing operations. Turkey is raised as a comparison when discussing how treaties define the territory they cover. The explanation treats geography as part of the political agreement establishing the alliance.