50 of the original countries
probably after the fall of the USSR The USSR (also known as the Soviet Union, which included Russia), was one of the original members of the United Nations. When the USSR broke up, the Russian Federation continued holding the exact same seat and Security Council position as was held by the USSR.
Continued freedom for South Korea.
it was signed by 50 out of 51 of the original countries.
Jan Smuts
He eventually supported the league-of-nations, although he continued to believe that U.S. military leadership was essential to world peace.Read more: theodore-roosevelt
E-JAM
Germany, Austria-Hungary, and Italy
Argentina !
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The League of Nations later turned into the United Nations. So basically the entire U.N. is the League of Nations. This originally consisted of 58 nations, and since I do not want to list them all, then just look up "League of Nations original members" on Bing.
Original Answer: Because they are decades away. Improved: The United Nations are not a country. They couldn't have "joined" the League of Nations. The League of Nations was the predecessor of the United Nations - the League of Nations failed, and so, many years later in 1942 (I believe it was that year) they founded the United Nations as an improved "League of Nations."