The term often leads into confusion, however, since international compact cars are somewhat larger than their North American equivalents, mostly because no supermini/subcompact size is manufactured by American, Mexican and Canadian car makers up to date.
By the late 1860's, Darwin came to describe this process as the survival of the fittest. This is very different from Lamarck's incorrect idea that the environment altered the shape of individuals and that these acquired changes were then inherited.
Social Darwinism was later expanded by others into ideas about  survival of the fittest  in commerce and human societies as a whole, and led to claims that social inequality, sexism, racism and imperialism were justified.