To get straight to the point and be more organized!!(:
Yes, World War I could have been prevented and spare many lives of men. The assassination of the Archduke Francis Ferdinand pretty much started it, so if only the assassination did not happen, there might be no World War I. Also, if only the allies did not step in and also declared war with other nations. However, the thing is the countries were already building their military forces that may be triggered them to declare a war.
President Franklin Roosevelt
Couple of reasons: First, he was a man with a considerable ego. There is no reasonable argument against him needing to be the centre of attention and the top of the heap.
Second, the Revolution, capital r, had failed. After the execution of Robespierre, certain people in positions of influence in France began to realise that popular rule and Rousseau's idealism wasn't helping anyone, in the form that it had manifested.
Hope this helped!
It is all of them. It does its best to stay out of armed conflicts. Once in however it is formidable foe. America did not formally enter WWII until Pearl Harbor.
One of the main thoughts America has is Human Rights but there are qualifications to that. Little was done about Rwanda, whereas the Middle East uses that argument all the time.
Ditto D.
Answer A