The war started mainly because of four aspects: <em>Militarism, Alliances, Imperialism and Nationalism.</em> This is because big armies become potential threats to other countries, other countries started forcing alliances in order to secure land.
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Social Classes of the Renaissance. The people of Renaissance Florence, like most city–states of the era, were composed of four social classes: the nobles, the merchants, the tradesmen and the unskilled workers.