This is the general name given to pre-columbian native american cultures who constructed earthen structures for religious, burial, and/or ceremonial purposes

Mound builders

Explanation:

The general term given to pre-Columbian Native American cultures who built earthen structures for religious, burial and ceremonial purposes is "mound builders." Mound builders were inhabitants of North America who used to build earthen mounds for religious, ceremonial and residential purposes. These people generally lived in the regions of the Great Lakes, the Ohio River Valley and the Mississippi River.

answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.

to unite muslims and hindus in resistance against british colonialism.