<span>The Industrial Revolution lead to Imperialism by Countries associated with the industrial revolution started to produce goods that were cheaper and people had better quality homes. Countries associated with the Industrial Revolution need material to produce there goods so they took over various parts of Africa. Africa had a limited source of supplies and raw materials.
I hope my answer is helps you.</span>
It proved a strong fighting spirit can make a difference
I don't see the following, but anything ethical based would usually work
I.e.: They are mistreated, one human's power over another is wrong, our nation's image is tarnished.
Avoid arguments about profit since they would argue in favor of slaves, and be careful about religion since it swings both ways (ex Slavery is a sin vs slavery allows slaves to learn religion) Hope this helps
If this doesn't help please comment the possible answers so I can further assist
