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...
Some Federalists reacted to the Louisiana Purchase with plans to secede from the Union because they feared that the acquisition would strengthen the power of the agrarian South and weaken their own influence, which was primarily based in the Northeast. They believed that the expansion would lead to the dominance of slave states and dilute their political power. Additionally, the Federalists were concerned about the implications of a vast new territory that could shift the balance of power in favor of the Democratic-Republicans, prompting some to contemplate secession as a means of preserving their political interests.