The philosophy of the Declaration, that government is set up by the people to secure their life, liberty, and happiness, and is to be overthrown when it no longer does that, is often traced to the ideas of John Locke, in his Second Treatise on Government. That was published in England in 1689, when the English were rebelling against tyrannical kings and setting up parliamentary government. The Declaration, like Locke's Second Treatise, talked about government and political rights, but ignored the existing inequalities in property. And how could people truly have equal rights, with stark differences in wealth?