Cleveland didn't start the most immoral war that is still defended today by a majority of people.
Good point; Gavrilo Princip was certainly a terrible president. I can't think of a single positive accomplishment of his administration; he might as well have never been elected!
*join
WWI had far worse effects than Cleveland's Presidency.
But what was Wilson supposed to do? He tried extensively for at least two years to get the Allies & Central Powers to negotiate a peace, to no avail. And it's quite difficult to argue that America's economic power didn't give the Allies the advantage necessary to end the war in Nov. 1918 as opposed to 1921 or whenever.