In total they ate 22 pieces and had 13 left
Mainly because it toughened-up the Fugitive Slave Act, allowing official slave-catchers to hunt down runaways.
This recruited many new Abolitionists, and caused Harriet Beecher Stowe to write 'Uncle Tom's Cabin'.
Answer: Stamp Act Tax
Explanation: It was passed in March 1765 and to be enacted on November 1