Building the National Road • Trees, stumps, brush, and rock were removed.
• Hills were leveled, and hollows were filled.
• Layers of stone were laid in graduated sizes.
Drainage ditches were dug.
which of the following was the most direct result of the environmental modifications listed
above?
A Federal regulations were adopted to ensure safety and ease of travel on the road.
B State governments cooperated closely to maintain road quality.
C Improved transportation to western states expanded trade and settlement.
D Road construction became a major industry in the United States.