Locke’s treatise is relevant to the purpose and need for the Declaration of Independence and the Constitution because of the historical context the authors (Locke, Jefferson and other American Revolutionaries) were writing in. When Locke wrote this treatise he was identifying what rulers (specifically a king) should be allowed (or not allowed) to do with their power and the purpose of that power. He was rebutting an argument that Kings should have absolute power because of patriarchy and his treatise defended a movement that limited a monarch’s power while increasing a parliament’s authority over the power of one individual. Thomas Jefferson and the other American revolutionaries are writing the Declaration to limit and abolish an oppressive king's power and the Constitutin to protect Americans from an oppressive government where one individual wields all power. Since the writer of the treatise and the authors of the American documents share similar purposes, it is natural that Locke’s treatise hugely inspired the Declaration and the Constitution.