um, why did you say not really...then go on to say, what the meme said?Not really
If you ever read it, most of the document is dedicated to defining the structure and responsibilities of the branches of government.
It was the Bill of Rights which defines the protections of citizens from the Government
Yes, it defines the structe and respsonbilities of Govt...ie...restrains the power of the Federal Govt and what it can do....specifically in Art 1 Sect 8.
Then of course the Bill of Rights and later Amendments restrain it further. For example, not allowing the Govt to conduct unreasonable searches and seizures, or requiring Due Process, including providing a lawyer etc