In what circumstances are national laws and rules better suited for promoting the common good than laws and rules of individual states?

s the president shall be commander in chief of the army and navy of the united states, and of the militia of the several states, when called into the actual service of the united states; he may require the opinion, in writing, of the principal officer in each of the executive departments. sooo yeahhh

explanation:

so what is your question?

b) the confederacy had to pay all union war expenses.