Declaring war and coining money are considered

Which would make the best heading for this list of notes about the migration of african-americans during the reconstruction era?

By choosing to resupply fort sumter, abraham lincoln risked a. abandonment of the fort by union soldiers. b. abandonment of the fort by confederate soldiers. c. the appearance of giving in to confederate secession. d. armed conflict with southern soldiers.

The most important units of the english armies which fought during the hindred years war were composed of