"It is a commonplace that the League of Nations is not yet-what its most enthusiastic protagonists intended it to be"

This quote by Hjalmar Branting is referring to the League of Nations, a worldwide organization established after World War I to promote international cooperation and peace. Branting is suggesting that the League of Nations has actually not yet achieved the objectives of its most passionate advocates. He is implying that the League of Nations has actually not yet had the ability to cause the peace and stability that its creators had actually expected. This is likely due to the reality that the League of Nations was unable to prevent the break out of World War II, despite its efforts to promote international cooperation. Branting's quote is a pointer that the League of Nations has not yet attained its complete potential, which there is still much work to be performed in order to produce the peace and stability that its founders had actually visualized.