Final answer:
Chamberlain likely used appeals to patriotism, duty, and the urgency of the times to persuade the Second Maine to join his regiment, similarly to how Continental Congress and leaders like Thomas Paine and Benjamin Franklin advocated for unity and resistance against tyranny.
Step-by-step explanation:
The reasoning used by Chamberlain to convince the Second Maine to join his regiment is not directly stated in the provided references. However, drawing from the general context of the American Revolutionary period, Chamberlain might have employed an appeal to patriotism, a sense of duty, and the critical situation of the times to persuade the men to continue fighting for their cause.
Motivations used in similar historical appeals include the defense of one's home and liberties, as represented by Thomas Paine's famous call to action against tyranny in "The American Crisis" and the inspirations drawn from the unity of the Iroquois Nation by Benjamin Franklin.
Factors such as the choice between liberty and slavery, and the idea of fighting not merely for oneself but for future generations, could have been significant in Chamberlain's arguments. Likewise, the Continental Congress's actions, such as preparation for war with the Olive Branch Petition unanswered, demonstrate the urgency and resolve that leaders like Chamberlain may have conveyed to sway the Second Maine.