Final answer:
The grievance about 'cutting off our Trade with all parts of the world' was included in the Declaration of Independence due to the British closing all ports except for Boston and limiting the colonists' ability to engage in international trade.
Step-by-step explanation:
The reason why the grievance about 'cutting off our Trade with all parts of the world' was included in the Declaration of Independence (DOA) was because:
The colonists could export goods only to Britain. (D)
These restrictions on trade greatly impacted the economic wellbeing and self-sustainability of the colonies, which contributed to their desire for independence from British rule.