Why did new imperialism end

In historical contexts, New Imperialism characterizes a period of colonial expansion by Western European powers, the United States, Russia and Japan during the late 19th and early 20th centuries.[1] 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 Western powers (and Japan) 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.

The qualifier "new" is used to differentiate modern imperialism from earlier imperial activity, such as the so-called first wave of European colonization between 1402 and 1815.[1][2] In the first wave of colonization, European powers conquered and colonized the Americas and Siberia; they then later established more outposts in Africa and various regions of Asia.

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