Why was Germans reoccupation of the Rhineland a significant turning point toward war?

The German reoccupation of the Rhineland in March 1936 marked a significant turning point toward war as it directly violated the Treaty of Versailles and the Locarno Treaties, undermining the post-World War I order in Europe. This bold move demonstrated Hitler's willingness to challenge the Allies and expand German territory, emboldening him to pursue further aggressive actions. The lack of a strong response from France and Britain signaled to Hitler that the Western powers were unwilling to confront his ambitions, ultimately leading to increased aggression and the onset of World War II.