What marked the separation of the carolinas

The carolinas are the u.s states of north Carolinas and south carolinas then they turnd northwestand marked the location with stakes

This is what i found on google “the first mobile phone call was made 40 years ago today. on april 3, 1973, motorola employee martin cooper stood in midtown manhattan and placed a call to the headquarters of bell labs in new jersey.” i hope this you for what your looking.