Final answer:
The Hossbach Memorandum outlined Hitler's aggressive plans, marking a significant step toward World War II as it indicated Germany's intentions to expand territory in violation of previous agreements, contributing to the tensions in the 1930s.
Step-by-step explanation:
The Hossbach Memorandum was a document that outlined Adolf Hitler's aggressive plans for foreign policy and territorial expansion, playing a significant part in the lead-up to World War II. Its significance lies in the fact that it signaled Germany's intention to expand aggressively, violating previous agreements such as the Treaty of Versailles.
Although not specifically named to remilitarize the Rhineland, it falls in line with Hitler's actions detailed within, which included building up a powerful military and breaking the terms of said Treaty by reoccupying the Rhineland and annexing territories like Austria and the Sudetenland.
The memorandum provided insight into the escalation of tensions in Europe during the 1930s, the appeasement policies of British and French leaders, and the cycle of aggression that further destabilized the peace in Europe, ultimately failing to prevent the outbreak of conflict.