Roosevelt and most Americans considered the Pearl Harbor attack to be a dirty trick, because it occurred while the Japanese ambassador was talking with the US about keeping peace in-between the two nations.
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Churchill was an effective leader and statesman because of his tremendous ability to inspire people; his unique strategic insight; his relentless passion; and his imperturbable personality.
Hard because they didn't get to do anything like votinhg
"He built a second capital in the East, which led to the division of the Empire" would be the best way to describe how Diocletian affected the Roman Empire, since it had grown to a state where managing it under a single entity was too difficult.