What giant buldings dominated Mayan cities

Which of the following was a key accomplishment of the people of songhai? a. they had a strong military and became the largest empire in west africa. b. they established a center of islamic scholarship. c. they worked with iron and prospered from the gold-salt trade. d. they dominated in the trade of ivory, enslaved people, and animal skins.

Refers to the biological heritage people use to identify themselves.

What is donald trump wanting to build and have finished by 2020?