Woodrow Wilson proposed a League of Nations at the Paris Peace Conference after World War One, but the United States never ended up joining it.
Many people opposed it, most world nations approved the plan. The US Senate rejected it twice and on one occasion, the US Senate's revisions to the League's charter was rejected by President Lincoln.
The USA was never was a member of the League of Nations, so to answer your question nothing different would have happened because they never joined.
President Woodrow Wilson tried to get Congress to approve the US entry into the League of Nations. The League of Nations was the predecessor to the United Nations.
No.
The US's rejection of the treaty caused many countries to withdraw from the League of Nations. The League of Nations late proved ineffective and was disbanded as the UN was formed in its place.
The other nations lost some confidence in the league
When the US refused to join the League of Nations this weakened the League of Nations severely. The US government relied on check and balance system as well at this time the US was going through the Great Depression. The League of Nations tried to impose an economical sanction against Italy. When the US found out about it they decided to trade everything Italy had to trade. Once the other countries found out about the decision of the US they realized that the League of Nations was ineffective.
The US's rejection of the treaty caused many countries to withdraw from the League of Nations. The League of Nations late proved ineffective and was disbanded as the UN was formed in its place.
Stroke
League of Nations.
did not join
Since the League of Nations is now defunct, there is probably no reason for them to now.