Essential Documents

The "Due Process of law" is a regular administration of the law. No people can be denied of their rights. Also you can't be accused of a law you don't know (secret laws) everyone need to know the laws.

Popular sovereignty is when we the people give the government power the to do what's best for us. This is essential democracy because it's guaranteed freedom and not be dominated by foreign nation.

I think unalienable rights are a essential to  a democratic because they said we are created equal, and have liberty.

Representative government is an electroal system where the people get to vote to chose the people who can represent their interest and concerns.