Which is not an achievement of mayan civilization? a. towering stone monuments called stelae b. a system of interconnected mountain roads and bridges c. advanced knowledge of mathematics d. a system of hieroglyph writing

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

the great wall of china worked as a defense for the feudal states of the zhou dynasty to the north. during the warring states period more walls were put up to defend the borders of the different kingdoms. it was semi successful because despite the wall, the mongols eventually conquered china also the great wall provided protection to the economic development and cultural progress, safeguarded the trading routes such as the silk road, and secured transmission of information and transportation. @jayxboof