An informal political group designed to gain and maintain power in a city was called

a. a political machine
b. a corrupt alliance.
c. an election league.
d. a party boss.

The answer is A. A political machine.

Explanation:

A political machine consists of a political group in which there is a boss or some small groups who receive the support of people as well as businesses. They usually refer to campaign workers. The boss or the small groups usually get rewards for the work done and their efforts.

The machine power's purpose is to get out the vote for their respective candidates the day in which there will be elections. Political machines are based primarily on the hierarchy as well as the different rewards for political power in which there is a well-designed party whip structure.

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explanation:

c. wright mills's sociological imagination suggest investigating to explain this increase?