Not a lot. The notion that the League could have saved the world from another war is absurd. It had no armed forces and its effectiveness was subject to western powers which themselves weren't much interested in stopping aggression that didn't directly threaten them. The League actually did much of value, but stopping great powers from initiating wars was entirely beyond its means. Europe failed the League rather than vice versa.
The League of Nation was created in 1920. As most of the destruction in World War One was in Europe, European nations were strong supporters of the League. One of the main purposes of the League was to prevent wars by having international disputes settled by an agreement. The League of Nations could not prevent many conflicts that erupted before World War Two came about.
The Manchurian Crisis of 1931 significantly weakened the League of Nations by exposing its inability to enforce collective security and resolve international conflicts effectively. When Japan invaded Manchuria, the League's response was slow and ultimately ineffective, leading to Japan's withdrawal from the organization. This failure undermined the League's credibility and authority, demonstrating that it could not prevent aggression by powerful nations, which contributed to the rise of militarism and tensions leading up to World War II.
It wasn't successful and it was successful in different ways; for successful you could mention that they could apply sanctions and for not being successful you could say they didn't have enough power to prevent war, and then sum it up with a conclusion. Anyway, the League of Nations tried to promote international peace and cooperation. It was demolished in the year 1946 because the league didn't have enough power to prevent a war.
The League of Nations should have tried to have better relations with Greece in the Corfu incident. They also could have negotiated with the Italians to prevent them from attacking Greece.
Unanimous voting in the League of Nations often led to paralysis in decision-making, as any single member could block proposals, even those with broad support. This requirement made it difficult to respond effectively to international crises, as consensus was hard to achieve among diverse nations with varying interests. Consequently, critical actions were delayed or abandoned, undermining the League's authority and effectiveness, and ultimately contributing to its failure to maintain peace and prevent conflicts in the interwar period.
The League of Nations was the first major attempt to create an international organization that could prevent war, and even though it failed, it was still an inspiration for the next attempt, the United Nations, which has done many important things even though it also has failed to prevent a great many wars.
He had To stop his effort to win support for the league of nations
The League did not have a powerful armed force and could not enforce the required resolutions. It could not keep its economic sanctions. It failed to prevent the second world war. Hence it was replaced by the United Nations.
You can read the story of the League of Nations in the attached link. I could find no evidence that France was a problem for the League of Nations. Germany was a big problem however.
The League of Nations had three kinds of sanctions:Verbal sanctions amounted to a warning.Economic sanctions could include a boycott or embargo.Military sanctions could include war.
Supporters of the League of Nations in the U.S. Congress refused to compromise with Lodge and his Republican bloc that were willing to ratify the Treaty of Versailles with some reservations. Together, it would have given the Treaty the two-thirds vote needed for ratification; however, the unwillingness to compromise doomed the Treaty ratification.
He wanted the League of Nations to be set up to prevent another World War. The League was started, but, even though the USA did not officially get into it, it failed when the Japanese invaded China, and the League of Nations could not do anything about it. Then Italy attacked Ethiopia, and Germany kept making more and more demand upon the other nations until it invaded Poland on September 1 1939 and WWII started. The League of Nations without any power to back it up was just a lot of talk that Japan, Italy, and Germany paid no attention to.