The southern states were Confederate states. The northern states were part of the Union. :)
Virginia, Arkansas, Tennessee, and North Carolina all stayed in the Union after the mass exodus of southern states. Once Lincoln ordered all Union states to gather together troops to help fight the Confederacy, the four chose to leave the Union instead of raising arms against their "Southern Brothers" as they called it!
The southern states threatened to leave the Union because of antislavery talks.
The slave states remaining in the Union were mainly border states. The "border states" economy wasn't as dependant on slavery as were their southern cousins. One Southern congressman even stayed in congress during the war. Vice President Andrew Johnson was also a strong supporter of the South and paid for it after he became president.
The states that were in secession; formed the Confederate States of America. Those states that did not, stayed with the Union. West Virgina broke off from Virginia and stayed with the Union and became a state. It was very simple. Either a state was with the CSA or the Union.
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states that stayed in the union were,minnesota ,wisconsin,iowa,illinois,maine,ny,nj,vermont,washington,and,missouri,indiane,ohio,delawere,maryland.
seceded from the union
The Union victory meant that the southern states never actually left the Union, so they didn't need to be readmitted.
Border States
because we no longer wanted to be part of the union, where the southern states were not considered soverign and the union states did not believe in states' rights like the south did
because we no longer wanted to be part of the union, where the southern states were not considered soverign and the union states did not believe in states' rights like the south did