One of the Roman Empire's most important achievements was: A.
creating the religious idea of polytheism.

B.
making sure people were treated equally.

C.
building many roads to connect their cities.

D.
ending the system of slavery.

C is the correct answer

Explanation:

They developed many new techniques for buildings and construction of all types including the invention of concrete, Roman roads, the invention of Roman arches, and incredibly well built aqueducts that ran for miles before they reached the end and delivered fresh water. With roads they expanded their empire by warfare and trade.

the mexican-american war was a conflict between the united states and mexico, fought from april 1846 to february 1848.

a true

explanation: