Pericles was know as "The Father of Democracy" and during his time of rulership Athens became a heavily democratic city and he also ruled when art and architecture were considered to be flourishing (reasoning for architecture flourishing during this time was the mix of different cultures and how they built, and was said to be a mix of Persian, Indian, greek and Egyptian)
The treaty of Versailles blamed the Germans for causing the war, even though it was the Austrians who started the war. The answer is that the allied powers blamed The Empire of Germany.