The second part of the Declaration of Independence is a

The second piece of the Declaration of Independence is the preamble, which acts as the executive summary of the document.

This allows the author to state at the outset what they are broadly arguing for, before getting into the full argument in the body of the text.

After the preamble comes the body of the text, which is broken up into two parts, and is followed by the conclusion.

They include the right to life, liberty and the pursuit of happiness. The government has a responsibility to protect these rights ... In the section, the Declaration of Independence lays out all of the transgressions of the King (and the British government) against the colonists.