Which of the following are examples of increased centralization of power? select all that apply.
a)the commerce clause
b)the comity clause
c)the due process clause
d)the incorporation doctrine
e)the nullification doctrine

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