If we were to divide the text of the United States Declaration of Independence into three major segments, they could be called:
1. Preamble: This section begins with the famous opening line, "When in the Course of human events...." and provides the introductory statements and reasons for writing the document.
2. Grievances: This section would include the list of grievances against King George III and the British government, outlining the colonists' specific complaints.
3. Conclusion: The final segment would encompass the concluding paragraphs that assert the decision to declare independence and the determination to defend that decision.
Each section serves a specific purpose in the Declaration, collectively expressing the justification for independence and the colonists' intent to establish a new nation.