Final answer:
Great Britain and France were the primary imperialist nations with vast colonial territories during the era of imperialism.
Explanation:
Great Britain and France were the two imperialist nations that controlled the most territories during the era of imperialism. By 1900, Britain held vast territories across Asia, Africa, and other regions, while France had significant colonial possessions in Africa and Indochina. Other major imperial powers included Germany, the Netherlands, Portugal, and Italy, each with their own colonial holdings.
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