<span>The economic system that was most prevalent in Europe of the Early Middle Ages was the manorial system, which some people equate with feudalism and some don't. During the Middle Ages, a mercantile system also developed slowly, until it became very important in the Late Middle Ages and, ultimately, dominant in the Renaissance.</span>
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The Nazis began experimenting with poison gas for the purpose of mass murder in late 1939 with the killing of patients with mental and physical disabilities in the Euthanasia Program.
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The principle of checks and balances is that each branch has power to limit or check the other two, which creates a balance between the three separate branches of the state. This principle induces one branch to prevent either of the other branches from becoming supreme, thereby securing political liberty.
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