Final answer:
Naturalism focuses on exploring gritty aspects of life while Naturalistic Imperialism refers to the growth of empires in the 19th century.
Step-by-step explanation:
The main difference between Naturalism and Naturalistic Imperialism in philosophical terms is that Naturalism is a style of writing that focuses on exploring the grittier side of life, tackling controversial subjects such as prostitution, murder, domestic violence, alcoholism, and madness. It is influenced by the literary theories of Emile Zola and Charles Darwin's writings about evolution, with Naturalists seeing human beings as at the mercy of hereditary traits and environmental forces beyond their control.
On the other hand, Naturalistic Imperialism refers to the enormous growth of European empires in the 19th century, with European powers controlling over 80% of the globe. It is characterized by global empire-building and the establishment of colonial rule. Naturalistic Imperialism is a historical concept related to political and economic domination.