What British act declared the American colonies in rebellion in 1775?

What British act declared the American colonies in rebellion in 1775? The answer is the Proclamation of Rebellion.

Officially titled A Proclamation for Suppressing Rebellion and Sedition, it was issued by King George III on August 23, 1775. The proclamation declared elements of the American colonies to be in a state of “open and avowed rebellion.”

It followed the outbreak of armed conflict between the colonies and British forces, including the battles of Lexington and Concord and Bunker Hill. The proclamation instructed imperial officials to suppress the rebellion and encouraged subjects to report those supporting the revolutionary cause.

The Prohibitory Act was a separate measure passed later in 1775. It cut off trade with the rebellious colonies and authorized a naval blockade, functioning as an escalation of the conflict rather than the formal proclamation declaring rebellion.