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In page Conventional warfare:

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The state was first advocated by Plato but found more acceptance in the consolidation of power under the Roman Catholic Church[citation needed]. European monarchs then gained power as the Catholic Church was stripped of temporal power and was replaced by the divine right of kings. In 1648, the powers of Europe signed the Treaty of Westphalia, which ended the religious violence for purely political governance and outlook, signifying the birth of the modern state.[1][2]