How did political machines gain and maintain power?

Explanation:

Who did Political machines gain some of their power from by performing favors for them? political machines offered services to voters and businesses in exchange for political or financial support. they gained control of local govt. in cities such as NYC, chicago, baltimore, and san francisco.

he risk-return relationship. generally, the higher the potential return of an investment, the higher the risk. there is no guarantee that you will actually get a higher return by accepting more risk. diversification enables you to reduce the risk of your portfolio without sacrificing potential returns.

explanation:

necessary and proper clause. the congress shall have power to all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states, or in any department or officer thereof.