Answer: D is right. But there are also many other reasons.
Explanation: League of Nations was formed by Allied powers (from the WW I) so consequently it was viewed as "League of Victors". Moreover USA did not join, may other states did not join and later on League of Nations was unable the prevent outbreak of WW II.
I am not going to answer in a paragraph of 125 words, but I will give you the answer to the first question; The United States didn't want another country to fall to communism. They officially got involved after the attack of the Gulf of Tonkin (U.S destroyers were stationed there and a radio came in that said they had been fired upon by North Vietnamese forces). (45 words BTW).
Answer:
Focus
Explanation:
I think sorry if its wrong
The United Nations was formed after World War II in order to mediate disputes among nations around the world.
The United Nations still exists today and has over 100 members. This organization has been extremely important in tackling issues all over the world. This includes the genocides in Bosnia, Rwanda, and Europe in general during World War II. The UN has also proved a forum where countries can speak about international issues, like nuclear weapons and political conflicts between different nations.