Answer:
They replaced the Sumerian legislatures. They united the city-states under one empire. ... They unified the city-states by increasing trade
The prompt cause was the death of Franz Ferdinand, the archduke of Austria-Hungary. His demise on account of Gavrilo Princip – a Serbian patriot with binds to the undercover military gathering known as the Black Hand – pushed the real European military forces towards war.
The Renaissance was a rebirth of ancient Greek and Roman thinking and styles, and both the Roman and Greek civilizations were Mediterranean cultures, as is Italy. The best single reason for Italy as the birthplace of the Renaissance was the concentration of wealth, power, and intellect in the Church.