federal courts have the right to
laws that they feel are violating the constitution.

federal courts have the right to nullify laws that they feel are violating the Constitution.  In order to do that, they first must review the laws.  After reviewing them, they may nullify them if they feel the laws are unconstitutional.

of course, there can be debate among the members of a court over whether a given law is unconstitutional.  However, the court as an entity does not enter explanation

explanation: j

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