What happened to the Holy Roman Empire after Charlemagne's death?

Charlemagn'es Death and Succession in 813, Charlemagne crowned his son Louis the Pious (778-840), king of Aquitaine,

Explanation:as co-emperor. Louis became sole emperor when Charlemagne died in January 814, endng his reign for more than four decades... Charlemagne was buried as the cathedral in Aachen

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….”