What does powder keg means?

The Balkans was known as the Powder Keg in Europe in the beginning of World War 1. They called in a powder keg because Europe was where most of the war was going to happen and they needed resources. So basically a powder keg is in a dangerous situation where they get all their natural resources for war.

Now go f your mom because this is all bs and nothing here is true! :) have a great day bietcchh