The sugar act happened because the British wanted to gain more money from themselves. The colonist were mad that they had to pay taxes on sugar so they then started to boycott British goods.
The British needed money to support support their army so they started to tax people for stamps and seals whenever they bought paper products. The act caused problems between the colonists and years later it lead to the cause of the American revolution.
The colonist were in the streets of Boston arguing with the British, one of the colonist hit Private Montgomery, so he then fired hid gun into the crowd. After this the colonist started to rebel against the British.