Answer:
the United States failed to ratify this treaty.
Explanation:
When the protocol was first signed in 1997, president Bill Clinton signed alongside all the other leaders. But Congress didn't ratify it and then in 2001, President George Bush Jr rejected the treaty altogether. Bush claimed that the protocol was inefficient, but did not take any alternative measures.
The protocol went into effect in 2004, but evidence shows it has been unable to curb the emission of CO2.
In 2013 there was another attempt, but this time neither Russia nor the US ratified it.
The League of Nations was founded in 1919 to keep the peace after World War I. But it failed to prevent World War II in 1939, so in 1945 the nations of the world set up a new organization, the United Nations (UN).
If you are familiar with the formula a+b= a2+2ab+b2, this will help you. You have to work backwards and find the common factors. Watch you tube videos and it will show you a x method, where you cross multiply. It is too sophisticated to explain while typing, but hope this will help