Question

What major Allied power refused to join the League of Nations following the end of World War I? France Great Britain United States Russia

Answer 1

The answer is United States.

The League of Nations came into being after the end of  WWI.  The task of the League of Nations was simple - to ensure that war never broke out gain.

American President Woodrow Wilson was particularly  horrified by the slaughter that had taken place in what was meant  to be a civilized part of the world. The only way to avoid a repetition of such a disaster was to  create an international body whose sole purpose was to maintain world peace and which would sort out international disputes as and when they occurred.

Support for the idea was great except in America where isolationism was taking root, and true to this,  America, whose president Woodrow Wilson, had dreamt up the idea,  refused to join it.

Germany  was certainly not invited, and Russia was not allowed to join because she had a communist government at the time.

Answer 2

The United States refused to join the League of Nations.

The League of Nations was the signature idea of US President Woodrow Wilson, point #14 of his 14 Points, an international peacekeeping association which he recommended for post-war settlements. The Treaty of Versailles adopted that idea, but back home in the United States, there was not support for involving America in any association that could diminish US sovereignty over its own affairs or involve the US again in wars beyond those pertinent to the United States' own national security.