What was the basis for the wealth of Ghana, Mali, and Songhai?

The federal goveremnt ability to draft people into the army is?

Name three new weapons that changed how ww! was fought and how?

What practical concern lay behind the promotion of longitudinally planned churches in 17th-century rome? a) allowing the circulation of pilgrimsb) interior lighting of the navec) support for the heavy domed) accommodating parishioners