Republicanism in the United States
Some other ideas also affected the Founding Fathers.  For example, in the 1600s, John Locke, an English philosopher, had created the idea of the "social contract."  This idea said that people agree to obey governments, and in return, those governments agree to protect the people and their rights.  This is like a contract made between the people and the government.  If the government breaks this contract, and does not protect the people's rights, then the people have the right to overthrow their leaders.  This idea was important to the Revolutionists.