Romans were able to battle at Sea which helped them to expand their nation. Not all nations had ships and not all nations could fight on water and land. The romans had that advantage.
The entire thing was about race. Only African people were targeted.
Could you explain this more on what you mean
Answer:
Social Darwinism cultivated the mindset that Europeans were biologically superior to any other culture or civilization. As a result, they believed it was their right as a "superior" group of peoples to take over "inferior" countries and "civilize them" (enforced european practices or economically exploited them). Their mindset: if they were a superior group of people, they were allowed to take over in order to ensure they do what is best for human evolution as a whole.