The Liberty boys were established as a protest against what

The correct answer is - protest against the British Empire's rule.

The Liberty Boys were a group of youngsters that wanted to see the United States as a free and independent country, and they were protesting and were very loud against the British rule. Even though they were in danger of being sentenced to death by hanging, they were brave and persistent, and in the end their goal was achieved, and the United States managed to become its own independent country.