Why did the united states fail to ratify the treaty of versailles

The Senate rejected the Treaty that was based primarily on the objections to the League of Nations. The United States wouldn't ratify the treaty and/or join the League of Nations.

I hope this helps.

one of the negative side effects were the economic losses the events of september 11th caused. many, many people lost their jobs as a result of a downturn in the economy after the terrorist attacks.

the right answer is the end of world war ii

after the end of a global wwii all the nations involved, in an attempt to create an organization to maintain world peace. this agreement would work settling international disputes via negotiation and arbitration instead of leading the issues escalate to another war.