I once had heavy debates here on this site on the origin of Southern culture, especially related to Scotland. The book "Albion's Seed" is very detailed on this subject. The Scots that primarily became the pioneers that blazed the trail across the Carolinas, the Mississippi Territories and Texas were Low-Land Scots, who became the Scots-Irish of Ulster, and the Border People of North England and South Scotland. They were, during the 13th to the 17th centuries, one of the most feared light cavalry forces in Europe. Queen Elizabeth I said if she had 10,000 in her army, England could conquer all of Europe. They saw more war and destruction than the Highlanders ever experienced. They were English speaking protestants, clannish beyond reason. They fought anybody to survive because their lands were invaded and destroyed time and time again as Scotland and England warred for centuries. They followed only one law, the Law of the Marches, and held a truce for one day a year for the clans to put down their lances and swords and solve grievances between the families, either side of the border. They were such a problem to the Kingdoms of Scotland and England many of their clans were banished to Northern Ireland and America.

If you have a surname in your ancestry that is

Dixon
Jackson
Armstrong
Bell
Nixon
Kerr
Crozier
Scott
Graham
Selby
Gray
Bromfield
Cranston
Kerr
Young
Douglas
Maxwell
Hall
Thomson
Little

and many others, you maybe a descendent of a Borderer, or Lowland-Scot.

The below link will show you the gathering that is held at Brewick-Upon-Tweed, northern England. Their culture here is more Scottish than English, their town changed hands over a dozen times.
I have been here, it is a beautiful sea-side, fortified old town.

https://vimeo.com/124311195