The definition of symbiosis has varied among scientists. Some advocated that the term symbiosis should only refer to persistent mutualisms, while others thought it should apply to any type of persistent biological interaction (in other words mutualistic, commensalistic, or parasitic).
The League of Nations failed for a couple of reasons: 1  The United States was not part of it. 2  More importantly, the countries in the League did not take the idea of collective security seriously.3  When countries attacked others, nothing was done. 4  For example, Italy attacked Ethiopia and Japan attacked China. The United States was not part of it. 2  More importantly, the countries in the League did not take the idea of collective security seriously. 3  When countries attacked others, nothing was done. 4  For example, Italy attacked Ethiopia and Japan attacked China. 5  In both cases, nothing serious was done.
In the 1930s there was a world-wide economic depression. Japan tried to overcome the depression by building up an empire. In 1932, the Japanese army invaded Manchuria and threw out the Chinese. They set up their own government there and called it Manchoukuo. China asked the League to help.ascist governments which believed in the survival of the strongest came to power in Germany and Italy. In the 1920s, the League had been quite successful. In the 1930s, it failed terribly. This page looks at its failure in Manchuria, and the next spread looks at its failure in Abyssinia.