Many philosophers wrote down their philosophies about the government and . a number of philosophers published books on the subject. they applied the idea of to social and political analysis. thomas hobbes wrote leviathan, a book about social structure and government. he wrote about the , an agreement in which the people exchanged some of their individual freedoms for the government’s protection.

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So the full paragraph would read:  Many philosophers wrote down their philosophies about the government and people's rights.  A number of philosophers published books on the subject. They applied the idea of natural law to social and political analysis. Thomas Hobbes wrote Leviathan, a book about social structure and government. He wrote about the social contract, an agreement in which the people exchanged some of their individual freedoms for the government’s protection.

in 1803 the louisiana purchase took place, doubling the size of the country. by 1840 almost 7 million americans had migrated westward in hopes of securing land and being prosperous. the belief that settlers were destined to expand to the west is often referred to as manifest destiny.

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