How is the policy of imperialism different from a rivalry for control of natural resources?

Imperialism was the forceful expansion country's territory to benefit them economically and politically. Expansion is done with intent, whether or not there are enough resources. This includes invading other countries and waging wars to only gain land. 

Rivalry for control of natural resources isn't as harsh, nor is it done to expand territory, it's only the competition to gain resources. 

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