What new innovation did the Confederacy use to threaten the Union blockade of Southern ports?

The blockade of the South during the Civil War, as well as Southern attempts to circumvent it, signaled a new era in naval warfare. Steam ships being used in war was new enough, but the Union and Confederate governments began building ironclad ships for use in battle.

both are true, the congress does have the power to create banks, even if this power is not specifically described in the constitution, since there is nothing restricting it and there is power given to the congress to make "all laws which shall be necessary and proper". maryland was not allowed to tax a branch of the national bank operating there, and the supreme court decided that no state could. both of these topics were discussed in a decision of the mcculloch v. maryland case in 1819.