Final answer:
The break-up letter was read to introduce the Declaration of Independence, symbolizing the end of the relationship between the American colonists and Great Britain. KG refers to King George III and AC refers to the American colonists.
Step-by-step explanation:
The break-up letter was read to introduce the Declaration of Independence because it served as a dramatic and powerful way to highlight the grievances and reasons for the American colonists' decision to separate from Great Britain. By presenting the declaration as a break-up letter, it made it clear that the colonists were ending their relationship with Britain and seeking independence.
The two parties breaking up in the letter are the American colonists and Great Britain. The declaration states that the colonists are dissolving the political bands that connect them with Britain, indicating the end of their relationship.
KG refers to King George III, who was the ruling monarch of Great Britain during the time of the American Revolution. AC refers to the American colonists, who were seeking independence from British rule.