Final answer:
The League of Nations imposed heavy reparations and territorial losses on Germany after World War I, resulting in feelings of resentment and injustice that contributed to future conflicts. The League's ineffectiveness and lack of authoritative power further undermined its role in maintaining peace.
Step-by-step explanation:
The League of Nations made several decisions that resulted in Germany feeling deeply wronged post-World War I. Heavy reparations and territorial losses were imposed on Germany by the Treaty of Versailles, with the country being forced to pay approximately $33 billion to the Allied Powers. Germany also lost significant territories such as Alsace-Lorraine to France, and its colonies were seized. Furthermore, its army was downsized and the manufacture of offensive weapons was prohibited. These decisions were perceived by Germany as unfair and humiliating, exacerbating the country's economic and political crises and setting the stage for the rise of Adolf Hitler.
While some Allies, like Britain and France, felt that the punishment of Germany was just, the League's inability to effectively enforce its decisions and lack of military power often rendered it ineffective in halting acts of aggression. Countries like Italy and Japan challenged the League's authority, illustrating its weak influence on international matters. Germany's exclusion from the League initially, along with other slighted nations like Russia, added to the sense of injustice and would contribute to international instability leading up to World War II.