Political rhetoric does more than simply convey partisan messages. It can also provide insight into changing conceptions of the relationship between the citizen and government, the ruled and the rulers.
So, for example, in its 1776 Declaration of Independence, the Continental Congress did not just lay out its case for seceding from the British Empire. Rather, it claimed that God had endowed men with certain inalienable rights, famously including “life, liberty, and the pursuit of happiness.” It also envisioned the citizenry as ultimately in a position of mastery over its government. When government ceased to serve their purposes, Congress claimed, “It is the Right of the People to alter or to abolish it, and to institute new Government, laying its foundation on such principles and organizing its powers in such form, as to them shall seem most likely to effect their Safety and Happiness.”