The influence and imperialism of Western Europe and associated states peaked in Asian territories from the colonial period beginning in the 16th century and substantially reducing with 20th century decolonization. It originated in the 15th-century search for trade routes to the Indian subcontinent and Southeast Asia that led directly to the Age of Discovery, and additionally the introduction of early modern warfare into what Europeans first called the East Indies and later the Far East. By the early 16th century, the Age of Sail greatly expanded Western European influence and development of the spice trade under colonialism. European-style colonial empires and imperialism operated in Asia throughout six centuries of colonialism, formally ending with the independence of the Portuguese Empire's last colony Macau in 1999. The empires introduced Western concepts of nation and the multinational state. This article attempts to outline the consequent development of the Western concept of the nation state.

In historical contexts, New Imperialism characterizes a period of colonial expansion by European powers, the United States, and Japan during the late 19th and early 20th centuries. The period featured an unprecedented pursuit of overseas territorial acquisitions. At the time, states focused on building their empires with new technological advances and developments, expanding their territory through conquest, and exploiting the resources of the subjugated countries. During the era of New Imperialism, the European powers individually conquered almost all of Africa and parts of Asia. The new wave of imperialism reflected ongoing rivalries among the great powers, the economic desire for new resources and markets, and a "civilizing mission" ethos. Many of the colonies established during this era gained independence during the era of decolonization that followed World War II.