I think the answer to this common problem in Mali and Songhai is,
Conflicts over leadership weakened the military.
Other choices are untrue about trade, civil wars, and famine.
I hope this helped you answer the problem that you have posted. Have a great day!
Answer: In the nineteenth century, England was able to use its already powerful merchant navy to sell the huge amounts of manufactured products made by the factories built as a result of the Industrial Revolution and the invention of steam-powered machines that enabled workers to work faster and yield a greater production than ever before. The economic power obtained through trade made it possible for England to conquer more countries where it could sell its products with no competition.
Hope I helped