Secede from the USA
What did the southerners threaten with
South Carolina thought the tarrif (taxes) were too high, so they threatened to secede
Well not sure there. But during the War of 1812 they threaten to secede which was their eventual downfall.
Leave the Union
Southern States would leave of secede
they sought ties with england and not france so they planned to secede from the union
they threatened to leave the Union and secede from it
During the war of 1812 they planned to secede from the United States
Congress continued to raise protective tariffs.
per the recent history channel documentary on the presidents which i saw (appropriately) on president's day, he stated that he would hang the governor of south carolina if that state made an attempt to secede from the union...
they were not getting their way of government and Federalists being merchants and lawyers were getting hit badly with affairs with Britain and France in the early 1800's