Why was the national road an important part of overland transportation in 1818? a. it was the only profitable turnpike in the united states.
b. it was successfully funded by tolls.
c. it was the only good route from maryland to the ohio river.
d. it was the first turnpike built by chartered companies.

it was the onl good route frm maryland to  the ohio river

Explanation:

answer; /// the correct answer is evidence of the olmec civilization has been found in southern american in a hot steamy forest, archaeologists have found earthen artifacts at several sites that were evidence of the olmec civilization. these   artifacts were mounds,courtyards and pyramids build of stones, also on top of the mounds were many monuments made of stone, some of these stone structures are very large, they weigh as much as 44

hold on ill go look