Because there was no enforcement capability if a nation was sanctioned.
The Senate
The US didn't want to get caught up in European affairs that had nothing to do with them again.
Woodrow Wilson
The US senate rejected joining the League of nations
the senate would not sign the treaty due to the fact the u.s. would have to join the league of nations (before UN) Joining the league of nations could involve the U.S. in European affairs. The U.S. would become isolationists till WW2
the League of Nations
One aim of the League of Nations (1919-1946) was to prevent world conflicts by diplomacy and negotiation. Although President Woodrow Wilson was instrumental in its creation, the Senate ultimately blocked the US from joining.
Although US President Woodrow Wilson had joined with other world leaders in the proposal to create the League of Nations, he had not carefully gaged American opinion on the matter. The US Senate rejected the idea of joining and most Americans agreed with that decision. The Senate and many Americans sought a more isolationist path to foreign policy.
No. And that's why it failed.
Henry Cabot Lodge; He feared that unqualified support of the League could drag Americans into future European wars by tying the country to unwanted alliances.
The U.S Senate
no.