The American invasion of Venezuela — along with fresh threats to annex Greenland — provide the world with a unique opportunity to perform a post-mortem examination on what was once known as the international rules-based legal order.

This legal order was based on rules enshrined in the United Nations Charter of 1945. Its collapse creates uncertainty that requires careful consideration from all those interested in world peace.

Read more: Trump's intervention in Venezuela: the 3 warnings for the world

First, however, it’s important to understand what legal orders are and how they can collapse.

Social rules come in different forms — some might be religious, some moral. But complex political communities tend to be ruled by another set of rules, legal ones.

Legal rules tend to be organized in what are commonly called legal orders, and these orders guide the actions of members of the political communities in their everyday lives. One goal of most legal orders is, usually, co-ordination among those who are part of a social group.

When we think about legal orders, we usually focus on the ones that are closer to our political communities, such as those connected to our cities, provinces and states. But there’s one legal order that tends to be ignored more often than not — the international legal order.

One defining feature of international legal orders is that they are far removed from people within their own political communities, so negotiations to establish shared rules are usually carried........

© The Conversation