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 government in response to the Boston Tea Party and other acts of defiance. These acts galvanized the colonies to come together in opposition to British rule, ultimately leading to the formation of the First Continental Congress and escalating tensions that would lead to the American Revolution.