The extensión of power of one another, often by territorical acquisition, is called

Imperialism

Explanation:

Since Imperialism is the state of being the most powerful, I can conclude that Imperialism is the correct answer, filling in the blank .

The extension of power of one another, often by territorical acquisation, is called imperialism.

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the united states has a federal government. the president is the head of the federal government of the united states. however, each state forms its government for administration purposes. the powers of the state governments are exercised within restricted state boundaries. and citizens participate in this government by voting.