Which city benefited the most from the silk road?

Over time, who did the nature of slavery change in america

1. america's first national road morse 2. joined lake erie with the hudson river cooper 3. steam-driven locomotive erie canal 4. allowed businesspeople to keep in touch with trends cumberland 5. telegraph code fulton 6. clermont telegraph

How does the use of the word official in this stage direction affect the mood of the scene ?