Final answer:
Protests against the Sugar Act of 1764 arose due to perceived infringements on the colonists' rights, stringent enforcement measures, trials without juries, and intentions to raise revenue rather than just regulate trade.
Step-by-step explanation:
The Sugar Act of 1764 was received with protests because it was seen by the colonists as an infringement on their rights. The act lowered duties on British molasses but increased enforcement against smuggling, shifted trials to vice-admiralty courts without juries, which many colonists perceived as a loss of a basic right. Moreover, the act intended to generate revenue from the colonies rather than just regulate trade. This, along with ending the profitable sugar and slave trade with the West Indies, angered colonists who believed they had the right to assess their own taxes.