What is the main difference between a parliamentary democracy and a presidential democracy?

The major difference between these two systems is that in a Presidential system, the President is directly voted upon by the people. He is answerable to the voters rather than the legislature. While in a parliamentary system, the legislature holds supreme power.

Explanation:

the declaration states, “we hold these truths to be self-evident, that all men are created equal, that they are endowed by their creator with certain unalienable rights, that among these are life, liberty, and the pursuit of happiness….”