It adapted the palmetto flag as its national banner and began preparing for a presumed Federal military response while working to convince other Southern States to secede as well and join in a Confederacy of Southern republics .
It adapted the palmetto flag as its national banner . 
 Soon after seceding , South Carolina began preparing for a presumed Federal military response while working to convince other Southern States to secede as well and join in a Confederacy of Southern republics .