The best description of how the Intolerable Acts affected the American colonies is: The acts caused the colonies to unify against the British government.
The Intolerable Acts were a series of punitive measures imposed by the British Parliament in response to the Boston Tea Party and other acts of colonial defiance. These measures galvanized the colonies to come together and resist British rule collectively, ultimately leading to the First Continental Congress and increased cooperation among the colonies in their efforts against British authority.