What ideologies did european countries use to justify their imperialist policies with their own countries and conquered regions?

According to the Merriam-Webster Dictionary, imperialism is "the policy, practice, or by gaining indirect control over the political or economic life of other areas

Explanation:

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in mcculloch v. maryland (1819) the supreme court ruled that congress had implied powers under the necessary and proper clause of article i, section 8 of the constitution to create the second bank of the united states and that the state of maryland lacked the power to tax the bank.

gibbons v. ogden, (1824), was a landmark decision in which the supreme court of the united states held that the power to regulate interstate commerce, granted to congress by the commerce clause of the united states constitution, encompassed the power to regulate navigation.