They agreed either because they were forced by their chief or the Spaniards or because they wanted to.
I believe you meant the red scare"" ... it was mass hysteria scare over the spread of communism in the US and the rest of the world
The resources that were traded on the Trans-Saharan trade were salt, slaves, and religion. The West African countries were trading their gold for salt. The slaves were sent North and served as slaves or slave concubines. Islam was spread through the use of the Trans-Saharan trade route.