How did imperialism change between 1600 and 1900?

In the 1600s Imperialism was based around colonialization in the Americas and establishing trade in the east.  During this period the Americas were being colonized intensely by the Europeans that were racing to gain as much land and prestige as possible.  In the east, however, the main goal was to reach the Spice Islands (modern day Indonesia) and establish trade routes for the spices the Europeans desperately craved.

Comparatively, in the 1900's Imperialism consisted of taking up land in places such as India, Africa, and Southeast Asia.  This was done in a "mission to civilize" meaning it was less about economics and now a more political and racial element were used to justify European conquest.

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