Final answer:
The 'why' question is answered by the phrase 'to warn colonials of Britain's arrival.' Paul Revere shouted 'the British are coming' and rode through Lexington on April 21, 1775 to warn the colonials of the impending arrival of the British forces.
Step-by-step explanation:
The answer to the 'why' question is 'to warn colonials of Britain's arrival.'
This answers the question of why Paul Revere shouted 'the British are coming'. He did so in order to warn the colonials that the British were coming.
On April 21, 1775, Paul Revere rode through the town of Lexington to alert the colonials that the British forces were on their way. This warning allowed the colonials to prepare and defend themselves against the impending attack.
Learn more about Paul Revere's warning during the American Revolution