Answer: I believe the taxes on tea and the stamp act.
Explanation: The Americans loved tea, and also didn't like taxes. (Kind of like now), and they didn't enjoy paying tax for it. In protest, they held the Boston Tea Party where the Sons Of Liberty threw tea bags into the ocean, which the British responded to by sending troops to occupy the area. The citizens protested, and it ended in the Boston Massacre.
For the Stamp Act... would you like to pay an extra dollar each time you went to buy something composed for paper? Of course not! Neither did the Americans, which made them angsty.
