Because the newly-elected Lincoln refused to allow the creation of any new slave-states.
So as new states joined the Union, Congress would be more dominated by the Northern free states, and would pass laws favouring the North, such as the tariffs on imports.
11
Seceding from the Union??
Secession
The seceding states left the union due to issues over states' rights and slavery. Also, general differences in the people and economy (North was much more industrial than the South) led to the eventual seccesion of the South.
Abraham Lincoln
They left the union to join the confedirety
President Buchanan did not force seceding states to return to the Union.
Withdrawing states say they are seceding from the union.
Because Lincoln had won the 1860 election on a ticket of no new slave-states.
11
Seceding from the Union??
Lincoln
Secession
Racial Republicans
"Seceding from the union" refers to the actions of the states that left the United States to form the Confederate States of America in the American Civil War.
Jefferson Davis
The seceding states left the union due to issues over states' rights and slavery. Also, general differences in the people and economy (North was much more industrial than the South) led to the eventual seccesion of the South.