The Articles of Confederation had some language in it. Those were quite famously superceded by a little document we call the Constitution. Sovcits will sometimes reference language used in the Articles to claim random stuff that just doesn't apply.

They'll also find random laws that can use niche definitions and stuff. As a sort of example, there's a section of federal law that pretty clearly excludes your personal car from the definition of "motor vehicle". Though I didn't dig much further, the definitions section began with, "For the purposes of this chapter the following definitions apply." Emphasis mine. They then use this to say states are not allowed to supercede ~~feeders~~ federal law and therefore the state is wrong.