In hindsight, there are many reasons that could contribute to the idea that the League of Nations was never going to function properly. For one thing, the League of Nations did not own a military force to use at its dispense for peacekeeping missions and such. Without an armed military base and means of force, there is no way that the League of Nations could have had an impact on situations. So naturally, there was a need to borrow troops for the member nations. Unfortunately, the members were hesitant to donate these troops. Without this armed force, the League was required to come up with another method to enforce its settlements. To solve this problem, the League decided to use economics to its advantage. The member nations would refuse to trade with the unruly nation in order to make an impact. This was quite ineffective since the League of Nations failed to note that the nation it is trying to penalize has the full ability to trade with countries that are not part of the League. (League of Nations)
France and Britain both felt as though their affairs should not get involved with the League of Nations. Being "Great Powers" and not being involved means a loss if impact for the League. France and Britain then fell to the method of appeasement as Adolf rose in power. (League of Nations). This policy differs from that needed to keep the League of Nations functioning at its full potential.
The greatest weakness of the League of Nations was the fact that the United States never joined, even though Woodrow Wilson was the architect of it. Without this power, success of the organization was inevitable. The United States held the keystone to the League's destiny of success or collapse (The Gap In the Bridge). This major power would have provided the necessary root for the League of Nations to succeed and make a difference.
During the 1930s, a few members began to leave the League, which most obviously decrease its power. Japan decided to leave when it felt as though the League of Nations was "euro-centric". Italy also left in 1937. When came to power, Germany was removed. The Soviet Union was forced out of the League due to aggression with Finland (League of Nations). With the exit of all of these powers, it was impossible for the League to have enough influence to actually have an impact.
Another huge weakness of the League of Nations concerned its decision-making process. A unanimous vote was...