Answer:
The first Continental Congress
Step-by-step explanation:
The letter was made as a form of protest toward the oppression that the British imposed to the colonies. The high tax that the king made the colonies pay made it really hard for them to earn enough profit to survive.
In the letter, the Congress stated that if not because this act of oppression, the colonies probably will keep being a loyal subjects to the empire. But since the British Empire refused to address this issue, it eventually led to the war for independence.