1. Montesquieu's separation of powers idea is: "Separate the parts of government so that no one part can become too powerful."
2. John Locke's natural law (natural rights) idea is: "People have rights to life, liberty, and property that the government most protect for the common good."
3. John Locke's improvement on social contract is: "If a ruler fails to protect the rights of the people, the people could choose new leaders."