Final answer:
The leader of the group of angry farmers who marched to a courthouse in 1786 was Daniel Shays; this incident is known as Shays' Rebellion.
Step-by-step explanation:
In 1786, a group of angry farmers, led by Daniel Shays, marched with guns to a courthouse as part of an uprising against the Massachusetts state government. This event, often referred to as Shays' Rebellion, was a response to the unfair treatment of indebted farmers. The rebels, mainly Revolutionary War veterans, including Job Shattuck alongside Daniel Shays, protested against high taxes, unfair legal practices, and the lack of relief for debtors, which threatened to take away their lands.