Good question. Try: jurisdiction holy Roman Empire, and see what comes up. Jstor might be a place to start. Or oxford: The Holy Roman Empire as a Legal System

Just remember, this is not an appearance like the United States or the Dutch Republic by an act of the People, but rather a behemoth that appeared over time through conquest, tribute, a complex patchwork of city-states,Hanse-cities where the Emperor could not enter without permission despite the name Imperial city (like Nijmegen)

What you will learn is the view the Founding -fathers took was quite apt. You might also consult: Law of Nations by Vattel, writings of Hugo Grotius.

And Iron Kingdom, as this book describes the uneasy balance between the Holy Roman Empire and Prussia. Prussia itself was outside the HRE, but parts of its lands were inside, and the King IN Prussia was a HRE Prince Elector.

Thus, in terms of learning what it means to be such an elector, this is pure gold.

Then there is a legal concept which protects the person of the Emperor, as he can do no wrong. From this the legal art of reaching the position of sovereignty is born.

Consulting the declaration of Independence, you will note that the effort beyond and above the call of duty to impress upon the person of the King for redress of grievances is clearly delineated. Why?

Once you get this, you start to comprehend what the Holy Roman Empire actually is. And it still is here, not the least the families who rules it, and want it re-emerge as the so called dissolution in 1806 was done under duress. SO, the claims are still made, renewed and valid.

Then consider the secret treaty of Verona. Now you start to see the true masters behind the Covid shit.

I will add one last tidbit, which also subverts the US legal system: UNIDROIT. his UN movement was started by ... drum, drum ... a legal professor in .....drum drum drum ... ROMAN LAW!