https://www.u-s-history.com/pages/h976.html
(you weren’t expecting me to type it all out, were you?!)
I was expecting you to give a thesis statement. You know, a summation of what it says in as few words as possible.
To put my finger on it's central core, I point to this sentence.
"That to secure these rights, Governments are instituted among Men, deriving their just powers from the consent of the governed, --That whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government, laying its foundation on such principles and organizing its powers in such form, as to them shall seem most likely to effect their Safety and Happiness."
If you have a different core sentence that you believe summarizes the soul of the Declaration of independence, please point it out.