Answer:
B.) The Northern economy was not threatened because of the secession of the southern states.
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1) the Constitution, federal laws made pursuant to it, and treaties made under its authority,
2) 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.
3) Yes, all treaties are the “supreme law of the land”
4) The congress can shut down the government.
