Shays's Rebellion was put down by a privately hired army

Which is likely the most significant obstacle to using a strategy such as unilateral pacifism or nonviolence, given the context of the Prisoner's Dilemma?

A) National interests B) Social injustice C) Lack of communication D) Lack of trust

There are differences among ethnic, religious, and regional groups, even among __________ Americans

Fill in the blank with correct word