Compare and contrast the treaties of Vienna (1815) and Versailles (1919). Why is one usually seen as a success while the other is generally thought a failure? (A creditable answer might consider the personalities involved, the problems they were addressing, the solutions they sought, and the historical period they delineated.)

Compare and contrast the treaties of Vienna (1815) and Versailles (1919). Why is one usually seen as a success while the other is generally thought a failure? (A creditable answer might consider the personalities involved, the problems they were addressing, the solutions they sought, and the historical period they delineated.)