Answer :
The correct answer to this open question is the following.
Although there is no other reference or context, we can say the following.
What all three documents agree that is the most likely reason people's rights will be threatened is a tyrant federal government that could exert absolute power and control over the citizens. The three documents are the Declaration of Independence, the Constitution, and the Bill of Rights.
The branch of government that all three documents imply is the source of people's power is the legislative branch because the citizens have the right to elect their representatives who had to attend people's claims to create the kind of legislation that protect them and create conditions tho thrive and prosper.