There are actually many causes of the American Revolution. 5 of the main ones are...
•The Proclamation of 1763 •The Quartering Act •The French and Indian War •The Boston Massacre •The Intolerable Acts
Here is a link that explains all of these if you don’t understand what these are : https://www.ducksters.com/history/american_revolution/causes_revolutionary_war.php
caused by colonial opposition to British attempts to impose greater control over the colonies and to make them repay the crown for its defense of them during the French and Indian War (1754–63)