Final answer:
John Locke proposed the concept of the social contract, where people consent to be governed in exchange for protection of their rights. If the government abuses its power, the people have the right to form a new government.
Step-by-step explanation:
One major idea proposed by John Locke was the concept of the social contract. According to Locke, people enter into an implicit agreement with their government, sacrificing a small portion of their freedom in exchange for protection of their lives, liberty, and property. Should the government abuse its power and deprive people of their rights, the social contract is broken, and the people have the right to withdraw their consent and form a new government.