Answer:
Darwinism is about the survival of the fittest - and European nations believed they must colonize or be colonized - that the strongest would win out.
Step-by-step explanation:
The Social Darwinism is a social and political construct that was used mostly during the 19th and 20th centuries, mostly by the imperial powers. Basically, the Social Darwinism suggest that the principles of survival among the humans are the same like those at the animals and plants, thus that the strongest and fittest survive, while the weak ones don't. This resulted in conquering new territories by the European imperial powers, but also lot of racism, neglect, and terrible behavior toward the people that were conquered.