Which ancient civilization is known as the Mound Builders?

This civilization settled in Western South America, mainly in the country of Peru.

This civilization is credited with being one of the firsts to use the number zero.

Which civilization built a 10,000 mile road system without using wheels or work animals?

Which civilization built chinampas, or floating gardens?

This civilization lived along major rivers in North America.

Which civilization created a calendar based on stars and planets and were known to be great astronomers and mathematicians?

A major city for this ancient civilization is Cahokia.

Which civilization ruled the longest for 4,000 years?

In which civilization did farmers build terraces to grow crops on steep mountainsides? Their biggest crop was potatoes.