Trade flourished because these progressing empires were developing new ways to produce products and utilize agriculture in their areas, such as Han with silk and Rome with olives and fishing/seafaring. These empires has never had access to goods that were from other areas before the Silk road, causing trade to become immensely popular and relied upon.
A)To protect convoys of merchant ships
It is located in North Carolina
The issue that caused sectionalism to develop were more geographical. It is mainly because the people in the North was growing more into an industrialized society, that is why they had industrial interest, whereas the South are more focused on their agricultural development.
The United States, France, and Britain combined their occupation zones in Deutschland to create West Germany.