In Sub - Saharan trade, gold , salt and slaves were the most important commodities.
Gold came from Bambuk in the valley of the Senegal where there was a lot of alluvial gold. Rock salt came from areas in the Sahara which were once covered by inland seas. Its extraction, in large blocks under the blazing sun, was appalling work carried out by slaves.
Slaves mainly came from around the region of Lake Chad, where the Zaghawa tribes made a habit of raiding their neighbors and selling them to Arab purchasers in the north.
Other important commodities were cola nuts, dates, copper and brass.
The answer to this question is A. The executive and legislative branches install judges, but cannot punish them for their rulings.
Members of the judicial branch will be elected by the president and must be confirmed by the Senate. They can technically fire the judge, but they need a viable reason that is not related with their rulings.
I believe the answer is: <span> for the federal government to apply the merit system
Merit system refers to a system of hiring or promotion that based on the person ability in doing their job.
Prior to this, the government officials were elected on a nepotism basis, where the ones that have inside connections are the one that most likely hired and promoted.</span>