Answer:
The U.S. Constitution calls itself the "supreme law of the land." This clause is taken to mean that when state constitutions or laws passed by state legislatures or the national Congress are found to conflict with the federal Constitution, they have no force.
It was important for the same reason it is now. Just as we now don’t like for the federal government to tell us what to do, This states who declared their independence from the union did not want the federal government to tell them what crops they could raise via whether they could use slave labor or not.
The correct answer is present progressive. The present progressive is used for an event that continues to occur at the present moment in time. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.