Final answer:
Davis asserts the necessity to raise an army and a navy for the Confederate States as a means for defense, to maintain internal order, and to protect their sovereignty and jurisdiction in the face of potential outside aggression.
Step-by-step explanation:
The statement by Davis speaks to the defensive posture of the newly formed Confederate States, indicating that the need to raise an army and a navy is primarily for purposes of defense. The Confederate States were aiming to secure their sovereignty, maintain peace and domestic tranquility within their territory, and to uphold the values delineated by the Constitution they believed in, including providing for the common defense and promoting the general welfare. The reference to the potential raising of arms is couched in the context of self-preservation; should their territory and jurisdiction be challenged, the Confederacy declared itself ready to defend against such aggression. The use of militia and more permanent armed forces reflects the Confederacy's view of the necessity to protect itself during uncertain times and the ongoing conflicts resulting from secession.