To what extent was industrialization responsible for the deplorable conditions of the cities in the early nineteenth century?

What was the mame given to the idea that americans should expand across the nation ro the pacific coast

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

Word does jefferson use in opening of the second paragraph that means "obvious? "