be successful in a large, diverse society
Basically the Americans in the Revolutionary War in the south South believed that the Civil War was very necessary and it was just defense of their rights and liberties.
The revolutionaries and the Confederates had cast themselves as heroes resisting a tyrannical and authoritarian of the government that they felt no longer deserved obeisance.
The Union, like the British of the Revolutionary era, believed that they had to preserve their nation and prevent the new nation from breaking away.
The correct answer to this open question is the following.
Although the question is incomplete because it does not provide a specific reference about the author of the letter or any other reference, we can comment on the following.
A primary source is the piece of information that was written by a character or an individual that lived in the moment of the event, was part of the event, or witnessed the event. This individual could have written a letter, or a document -including a book. Or he/she took a photograph. Or was part of an interview. The secondary source includes information from a third person who was not part of the time or event but has found information through other resources. It is the case of an encyclopedia or researchers/historian books.
Answer:
The powers assumed by the government that are not specifically listed in the constitution. Inherent powers. Powers that historically have been recognized as naturally belonging to all governments that conduct the business of a sovereign nation.