Why are islands so important when it comes to imperialism?

The word “imperialism” is widely used as an emotive—and more rarely as a theoretical—term to denote specific forms of aggressive behavior on the part of certain states against others; the concept refers primarily to attempts to establish or retain formal sovereignty over subordinate political societies, but it is also often equated with the exercise of any form of political control or influence by one political community over another.

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answer is :

many churches split during the movement.

new religions grew in popularity.