Abstract
The first explanation that could be found, and maybe the most evident, is the war itself. The concept of war as well as its substance generated strong protests in reaction, because it united the many independent interests that the anti-war movement used to consist of.
Indeed, the basis of war opponents' argumentation is pacifism. This is the theoretical side of the movement. It is the philosophical part of protests: protest against the concept of war, whatever the war is about.
This basis is a mix of various concepts such as 'pacifism', 'anti-war', 'non-violence', 'anti-militarism' or even "alternative movement" and "civil disobedience". First of all, it is important to distinguish these concepts and to understand the reason why these expressions can refer to a single movement.
