Who is known for inventing and building the world's first successful airplane? a) thomas edison b) robert fulton c) the wright brothers d) alexander graham bell

The league of nations was found in 1919 to keep peace after world war l.but it failed to prevent world war ll in 1939,so in 1945 the nations of the world set up a new organization,the united state (un).since then, the un has encouraged international cooperation and worked to resolve conflict

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