Which of the following was the most direct result of the environmental modifications listed above?

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?

federal regulations were adopted to ensure safety and ease of travel on the road
state governments cooperated closely to maintain road quality
improved transportation to western states expanded trade and settlement
road construction became a major industry in the United States

The correct answer is improved transportation to western states expanded trade and settlement.

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