Since there is no general agreement on which states are southeast and since you don't say whether you mean only ocean coasts, this answer assumes that southeast states are Mississippi, Alabama, Florida, Georgia, South Carolina, North Carolina and Virginia. All have ocean coasts. If you add Kentucky and Tennesee to the list, they have river coasts. When asking a question, it is a good idea to be a specific as you can.
In 1710, due to disputes over governance, the Carolina colony began to split into North Carolina and South Carolina. The latter became a crown colony in 1729. It had nothing to do with the Civil war as both Carolinas exhisted before the War and both sides joined the South
New EnglandProvince of New Hampshire, later New HampshireProvince of Massachusetts Bay, later Massachusetts and MaineColony of Rhode Island and Providence Plantations, later Rhode IslandConnecticut Colony, later Connecticut.Middle ColoniesProvince of New York, later New York and Vermont[1]Province of New Jersey, later New JerseyProvince of Pennsylvania, later PennsylvaniaDelaware Colony (before 1776, the Lower Counties on Delaware), later DelawareSouthern Colonies (depending on the subject under discussion, Virginia and Maryland may be grouped as the Chesapeake Colonies)Province of Maryland, later MarylandColony and Dominion of Virginia, later Virginia, Kentucky and West VirginiaProvince of North Carolina, later North Carolina and TennesseeProvince of South Carolina, later South CarolinaProvince of Georgia, later Georgia
Pennsylvania is located in the Middle Atlantic portion of the United States, and it is bordered to the north by Lake Erie and New York, to the east by New Jersey (across the Delaware River), to the south by Maryland, to the southwest by West Virginia, to the southeast by Delaware, and to the west by Ohio.
Virginia now became west Virginia and Virginia
Moving from West Virginia to South Carolina you are traveling south. There are about 421 miles between South Carolina and West Virginia.
West Virginia is north of South Carolina.
North Dakota South Dakota North Carolina South Carolina West Virginia
West Virginia is north and a bit west from South Carolina.
If you travel straight north from most parts of South Carolina, you would eventually cross into West Virginia. From the easternmost parts of South Carolina, you would have to go north and a bit west to get into West Virginia.
Tennessee is west of North Carolina and shares a border with it.
4 Virginia (North) South Carolina (South) Tennessee (West) Georgia (South West)
South Dakota is farther west than either North Carolina or West Virginia. North Carolina is located on the east coast of the United States. West Virginia is located about 80 miles north of North Carolina.
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southeast
West Virginia is pretty much due North of South Carolina.
South Carolina, North Carolina, Virginia, West Virginia, Maryland, Pennsylvania, New Jersey.