What was the greatest cause of World War I

Need will give brainliest which of the following was the most significant aspect of revel's election to the senate?

Which of the following arguments decided the debate over using the atomic bomb against japan in 1945? using the bomb would destroy the armaments still available to japanese forces in japan. using the bomb would demonstrate the power of the united states to the entire world. using the bomb would shorten the war and avoid heavy casualties among invading troops. using the bomb would enable allied forces to invade and take over the japanese mainland

During the age of imperialism, suez canal connected which two bodies of water?